\bibitem{Kar98} D. Karlen, talk presented at ICHEP '98, Vancouver, July~1998.
\bibitem{Hol98} W. Hollik, talk presented at ICHEP '98, Vancouver, July~1998.
\bibitem{Herb77}
  S.W. Herb {\it et al.}, \prl{39}{1977}{252}.
\bibitem{TOP95}
  F. Abe {\it et al.} (CDF Collaboration), \prl{74}{1995}{2626};\\
  S. Abachi {\it et al.} (D0 Collaboration), \prl{74}{1995}{2632}.
\bibitem{CDFD098}
  R. Partridge, talk presented at ICHEP '98, Vancouver, July~1998.
\bibitem{Vel77}
  M. Veltman, \app{8}{1977}{475}; \plb{70}{1977}{253}.
\bibitem{Teu98} 
  F. Teubert, Proceedings of the {\it IVth Int.\ Symp.\ on
    Radiative Corrections}, Barcelona, Sept.~8-12, 1998; hep-ph/9811414.
\bibitem{Mh_LEP} 
  P. McNamara, talk presented at ICHEP '98, Vancouver, July 1998.
\bibitem{VelSS} 
  M. Veltman, {\it SCHOONSCHIP}, CERN preprint,
  1967;\\ H. Strubbe, \cpc{8}{1974}{1}.
\bibitem{macsyma} MACSYMA Reference manual version 9, MIT {\it
    Lab.~Comp.~Sci.} (1977).
\bibitem{reduce} A.C. Hearn, {\it REDUCE user's manual Version 3.5}
  (RAND publication, Santa Monica 1993).
\bibitem{Wolfram} 
  S. Wolfram, {\it Mathematica --- a system for doing
    mathematics by computer} (Addison-Wesley, New York, 1988).
\bibitem{form}
  J.A.M. Vermaseren, {\it Symbolic Manipulation with FORM},
  (Computer Algebra Netherlands, Amsterdam, 1991).
\bibitem{PasVel79} G. Passarino and M. Veltman, \npb{160}{1979}{151}.
\bibitem{CheTka81}
  F.V. Tkachov, \plb{100}{1981}{65};\\
  K.G. Chetyrkin and F.V. Tkachov, \npb{192}{1981}{159}.
\bibitem{numcalc} see, e.g.:
A. Czarnecki, U. Kilian, and D. Kreimer, \npb{433}{1995}{259};\\
J. Fleischer {\it et al.}, \epjc{2}{1998}{747};\\
D.E. Soper, \prl{81}{1998}{2638};\\
S. Groote, J.G. K\"orner, and A.A. Pivovarov, Rep.~No.~MZ-TH-98-09 (1998);
hep-ph/9806402;\\
R. Kreckel, D. Kreimer, and K. Schilcher, \epjc{6}{1999}{693}.
\bibitem{CheKatTka79DinSap79CelGon80}
  K.G. Chetyrkin, A.L. Kataev, and F.V. Tkachov, \plb{85}{1979}{277};\\
  M. Dine and J. Sapirstein, \prl{43}{1979}{668};\\
  W. Celmaster and R.J. Gonsalves, \prl{44}{1980}{560}.
\bibitem{GorKatLar91SurSam91}
  L.R. Surguladze and M.A. Samuel, \prl{66}{1991}{560}; (E) ibid., 2416;\\
  S.G. Gorishny, A.L. Kataev, and S.A. Larin, \plb{259}{1991}{144}.
\bibitem{Che97R}
  K.G. Chetyrkin, \plb{391}{1997}{402}.
\bibitem{CheKueSte96}
  K.G. Chetyrkin, J.H. K\"uhn, and M. Steinhauser, \plb{371}{1996}{93};
  \npb{482}{1996}{213}; \npb{505}{1997}{40}.
\bibitem{InaKubOka83}
  T. Inami, T. Kubota, and Y. Okada, \zpc{18}{1983}{69}.
\bibitem{DjoSpiZer91}
  A. Djouadi, M. Spira, and P.M. Zerwas, \plb{264}{1991}{440}.
\bibitem{RitVerLar97}
  T. van Ritbergen, J.A.M. Vermaseren, and S.A. Larin,
  \plb{400}{1997}{379}.
\bibitem{Che97VerLarRit97} K.G. Chetyrkin, \plb{404}{1997}{161};\\
  J.A.M. Vermaseren, S.A. Larin, and T. van Ritbergen, \plb{405}{1997}{327}.
\bibitem{HarSeiSte97} 
  R. Harlander, T. Seidensticker, and M. Steinhauser, \plb{426}{1998}{125}.
\bibitem{BauWei97}
  S. Bauberger and G. Weiglein, \plb{419}{1998}{333}.
\bibitem{BHKPYZ98} 
  E. Boos, H.-J. He, W. Kilian, A. Pukhov, C.-P. Yuan, and P Zerwas, 
  \prd{57}{1998}{1553}.
\bibitem{Avd95}
  L. Avdeev, J. Fleischer, S. Mikhailov, and O. Tarasov,
  \plb{336}{1994}{560}; (E) \ibid{B 349}{1995}{597}.
\bibitem{CheKueSte951}
  K.G. Chetyrkin, J.H. K\"uhn, and M. Steinhauser,
  \plb{351}{1995}{331}.
\bibitem{CheKueSte952}
  K.G. Chetyrkin, J.H. K\"uhn, and M. Steinhauser,
  \prl{75}{1995}{3394}.
\bibitem{LarTkaVer91}
  S.A. Larin, F.V. Tkachov, and J.A.M. Vermaseren, \plb{272}{1991}{121}.
\bibitem{LarRitVer94}
  S.A. Larin, T. van Ritbergen, and J.A.M. Vermaseren, \npb{427}{1994}{41}.
\bibitem{LarNogRitVer96}
  S.A. Larin, P. Nogueira, R. van Ritbergen, and J.A.M. Vermaseren,
  \npb{492}{1997}{338}.
\bibitem{LarRitVer95CheKwi96}
  S.A. Larin, T. van Ritbergen, and J.A.M. Vermaseren, \plb{362}{1995}{134};\\
  K.G. Chetyrkin and A. Kwiatkowski, \npb{461}{1996}{3}.
\bibitem{HarSte97}
  R. Harlander and M. Steinhauser, \prd{56}{1997}{3980}.
\bibitem{HarSte98}
  R. Harlander and M. Steinhauser, \epjc{2}{1998}{151}.
\bibitem{DenDitHah97}
A. Denner, S. Dittmaier, and T. Hahn, \prd{56}{1997}{117};\\
A. Denner and T. Hahn, \npb{525}{1998}{27}.
\bibitem{CzaKraMar96}
  A. Czarnecki, B. Krause, and W.J. Marciano, \prl{76}{1996}{3267}.
\bibitem{CzaKra97}
  A. Czarnecki and B. Krause, \prl{78}{1997}{4339}.
\bibitem{FriKniKreRie96}
  A. Frink, B.A. Kniehl, D. Kreimer, and K. Riesselmann,
  \prd{54}{1996}{4548}.
\bibitem{CzaMel97}
  A. Czarnecki and K. Melnikov, \prl{78}{1997}{3630}.
\bibitem{CzaMel98b} 
  A. Czarnecki and K. Melnikov, \prd{59}{1999}{014036}.
\bibitem{CzaMel98}
  A. Czarnecki and K. Melnikov, \prl{80}{1998}{2531}.
\bibitem{BenSmi98}
  M. Beneke and V.A. Smirnov, \npb{522}{1998}{321}.
\bibitem{HoaTeu98} A.H. Hoang and T. Teubner, \prd{58}{1998}{114023}.
\bibitem{BenSigSmi98}
  M. Beneke, A. Signer, and V.A. Smirnov, \prl{80}{1998}{2535}.
\bibitem{comphep} E.E.~Boos, M.N.~Dubinin, V.A.~Ilin, A.E.~Pukhov,
  V.I.~Savrin, {\it CompHEP: specialized package for automatic
    calculations of elementary particle decays and collisions},
  Rep.~No.~SNUTP-94-116 (1994); hep-ph/9503280;\\
  P.A. Baikov {\it et al.}, {\it 10th International
    Workshop on High-energy Physics and Quantum Field Theory (NPI MSU
    95), Zvenigorod, Russia, 19-26 Sep 1995}; hep-ph/9701412.
\bibitem{tHoVel72}
  G. 't~Hooft and M. Veltman, \npb{44}{1972}{189}.
\bibitem{tHo73}
  G. 't~Hooft, \npb{61}{1973}{455}.
\bibitem{BarBurDukMut78}
  W.A. Bardeen, A.J. Buras, D.W. Duke, and T. Muta,
  \prd{18}{1978}{3998}.
\bibitem{BreMai77} 
  P. Breitenlohner and D. Maison, \cmp{52}{1977}{11}.
\bibitem{Bro92} 
  D.J. Broadhurst, \zpc{54}{1992}{599}.
\bibitem{Avd97}
  L.V. Avdeev, \cpc{98}{1996}{15}.
\bibitem{Bro98}
  D.J. Broadhurst, Rep.~No. OUT-4102-72, hep-th/9803091.
\bibitem{GraBroGraSch90} 
  N. Gray, D.J. Broadhurst, W. Grafe, and K. Schilcher,
  \zpc{48}{1990}{673}.
\bibitem{BroGraSch91}
  D.J. Broadhurst, N. Gray, and K. Schilcher,
  \zpc{52}{1991}{111}.
\bibitem{LapRem96}
  S. Laporta and E. Remiddi, \plb{379}{1996}{283}
\bibitem{RitStu98}
  T. van Ritbergen and R.G. Stuart, \prl{82}{1999}{488}.
\bibitem{Bai96}
  P.A. Baikov, \plb{385}{1996}{404};
  \nima{389}{1997}{347}.
\bibitem{BaiSte98} P.A. Baikov and M. Steinhauser, hep-ph/9802429; {\it
    Comp.\ Phys.\ Commun.} (in press).
\bibitem{WeiSchBoe94}
  G. Weiglein, R. Scharf, and M. B\"ohm, \npb{416}{1994}{606}.
\bibitem{Denner:habil} 
  A. Denner, \fortp{41}{1993}{307}.
\bibitem{Stu88}
  R.G. Stuart, \cpc{48}{1988}{367};\\
  R.G. Stuart and A. G\'ongora-T, \cpc{56}{1990}{337};\\
  R.G. Stuart, \cpc{85}{1995}{267}; (E)~\ibid{88}{1995}{347}.
\bibitem{OldVer89}
  G.J. van Oldenborgh and J.A.M. Vermaseren, \zpc{46}{1990}{425}.
\bibitem{Stu98}
  G. Devaraj and R.G. Stuart, \npb{519}{1998}{483}.
\bibitem{Dav91}
  A.I. Davydychev, \plb{263}{1991}{107}.
\bibitem{Tar96}
  O.V. Tarasov, \prd{54}{1996}{6479}.
\bibitem{Tar97}
  O.V. Tarasov, \npb{502}{1997}{455}.
\bibitem{FleJegTarVer99}
  J. Fleischer, F. Jegerlehner, O.V. Tarasov, and O.L. Veretin,
  \npb{539}{1999}{671}.
\bibitem{TarRhein98}
  O.V. Tarasov, \app{29}{1998}{2655}.
\bibitem{CheGorTka82}                          
  K.G. Chetyrkin, S.G. Gorishny, and F.V. Tkachov, \plb{119}{1982}{407}.
\bibitem{Tka83}
  F.V. Tkachov, \plb{125}{1983}{85}.
\bibitem{BroGen84} D.J. Broadhurst and S.C. Generalis, 
  Rep.~No.~OUT-4102-12 (1984).
\bibitem{CheSpi87}
  K.G. Chetyrkin and V.P. Spiridonov, \yadfiz{47}{1988}{818}.
\bibitem{PivTka84}
  G.B.~Pivovarov and F.V.~Tkachov,
  Rep.~No.~INR P-0370 (Moscow, 1984); \\
  F.V.~Tkachov, {\it Int.\ Journ.\ Mod.\ Phys.} {\bf A 8} (1993) 2047; \\
  G.B.~Pivovarov and F.V.~Tkachov,  {\it Int.\ Journ.\ Mod.\ Phys.} {\bf A 8}
  (1993) 2241.
\bibitem{GorLar87}
  S.G. Gorishny, S.A. Larin, and F.V. Tkachov, \plb{124}{1983}{217};\\
  S.G.~Gorishny and S.A.~Larin,
  \npb{283}{1987}{452};\\
  S.G.~Gorishny, \npb{319}{1989}{633}.
\bibitem{CheSmi87}
  K.G.~Chetyrkin and V.A.~Smirnov,
  Rep.~No.~INR P-518 (Moscow, 1987); \\
  K.G. Chetyrkin, \tmf{75}{1988}{26};\\
  K.G.~Chetyrkin, Rep.~No.~MPI-PAE/PhT 13/91 (Munich, 1991); \\
  V.A.~Smirnov, \cmp{134}{1990}{109}.
\bibitem{Smi91} V.A.~Smirnov, {\it Renormalization and Asymptotic
    Expansion} (Birkh\"auser, Basel, 1991).
\bibitem{Smi95} 
  V.A. Smirnov, \mpl{10}{1995}{1485}.
\bibitem{Davetal}
  A.I. Davydychev and J.B. Tausk, \npb{397}{1993}{123};\\
  A.I. Davydychev, V.A. Smirnov, and J.B. Tausk, \npb{410}{1993}{325};\\
  F.A. Berends, A.I. Davydychev, V.A. Smirnov, and J.B. Tausk,
  \npb{439}{1995}{536}.
\bibitem{Smi97}
  V.A. Smirnov, \plb{394}{1997}{205}.
\bibitem{CzaSmi97}
  A. Czarnecki and V.A. Smirnov, \plb{394}{1997}{211}.
\bibitem{AvdKal97}
  L.V. Avdeev and M.Yu. Kalmykov, \npb{502}{1997}{419}.
\bibitem{Smi97_2}
  V.A. Smirnov, \plb{404}{1997}{101}.
\bibitem{CheKue94}
  K.G. Chetyrkin and J.H. K\"uhn, \npb{432}{1994}{337}.
\bibitem{Che93}
  K.G. Chetyrkin, \plb{307}{1993}{169}.
\bibitem{HoaJezKueTeu94}
  A.H. Hoang, M. Je\.zabek, J.H. K\"uhn, and T. Teubner, \plb{338}{1994}{330}.
\bibitem{Teudiss} T. Teubner, Ph.~D.~thesis, University of Karlsruhe
  (Shaker Verlag, Aachen, 1996).
\bibitem{Stediss}
  M. Steinhauser, Ph.~D.~thesis, University of Karlsruhe
  (Shaker Verlag, Aachen, 1996).
\bibitem{Sei:dipl} Th. Seidensticker, Diploma thesis (University of
  Karlsruhe, 1998), unpublished.
\bibitem{BjoChe66}
  J.D. Bjorken and M.C. Chen, \pR{154}{1967}{1335};\\
  O. Reading Henry, \pR{154}{1967}{1534}.
\bibitem{ref::calkul} P. De Causmaecker, R. Gastmans, W. Troosts, and T.T.
  Wu, \plb{105}{1981}{215}; \npb{206}{1982}{53};\\ F.A. Berends, R.
  Kleiss, P. De Causmaecker, R. Gastmans, W. Troosts, and T.T. Wu,
  \npb{206}{1982}{61}; \npb{239}{1984}{382 and 395}; \npb{264}{1986}{243
  and 265}.
\bibitem{ref::helamp}
  F.A. Berends, P.H. Daverveldt, and R. Kleiss, \npb{253}{1985}{441};\\
  R. Kleiss and W.H. Stirling, \npb{262}{1985}{235};\\
  C. Mana and M. Martinez, \npb{287}{1987}{601}.
\bibitem{BalMai95} 
  A. Ballestrero and E. Maina, \plb{350}{1995}{225}.
\bibitem{FeynArts} 
  J. K\"ublbeck, M. B\"ohm, and A. Denner,
  \cpc{60}{1990}{165};\\
  H. Eck and J. K\"ublbeck, {\it Guide to FeynArts~1.0} (W\"urzburg, 1992);\\
  H. Eck, {\it Guide to FeynArts~2.0} (W\"urzburg, 1995);\\
  T. Hahn, {\it FeynArts~2.2 User's Guide} (Karlsruhe, 1998).
\bibitem{Nog93} P. Nogueira, \jcp{105}{1993}{279}.
\bibitem{MINCER1} 
  S.G. Gorishny, S.A. Larin, and F.V. Tkachov,
  Rep.~No.~INR P-0330 (Moscow, 1984);\\
  S.G. Gorishny, S.A. Larin,
  L.R. Surguladze and F.V. Tkachov, \cpc{55}{1989}{381}.
\bibitem{mincer2} 
  S.A. Larin, F.V. Tkachov, and J.A.M. Vermaseren,
  Rep.~No.~NIKHEF-H/91-18 (Amsterdam, 1991).
\bibitem{SHELL2}
  J. Fleischer and O.V. Tarasov, \cpc{71}{1992}{193}.
\bibitem{FeynCalc}
  R. Mertig, M. B\"ohm, and A. Denner, \cpc{64}{1991}{345}.
\bibitem{FormCalc} 
  T. Hahn and M. Perez-Victoria, Rep.~No.~KA-TP-7-1998,
  hep-ph/9807565 (Karlsruhe, 1998);\\ 
  T. Hahn, {\it FormCalc and LoopTools 1.2 User's Guide} (Karlsruhe, 1998).
\bibitem{Bauetal} 
  S. Bauberger, F.A. Berends, M. B\"ohm, and M. Buza, \npb{434}{1995}{383}.
\bibitem{ffmanual}
  G.J. van Oldenborgh, {\it FF --- a package to evaluate one-loop Feynman
  diagrams}, Rep.~No.~NIKHEF-H/90-15 (Amsterdam, 1990).
\bibitem{ProcDia}
  G. Degrassi, P. Gambino, and S. Fanchiotti, unpublished.
\bibitem{XLOOPS} 
  L. Br\"ucher, J. Franzkowski, and D. Kreimer, Rep.~No.~MZ-TH/97-35,
  hep-ph/9710484 (Mainz, 1997).
\bibitem{CzaKilKre95} 
  A. Czarnecki, U. Kilian, and D. Kreimer, \npb{433}{1995}{259}.
\bibitem{MAPLE} 
  B. W. Char {\it et al.}, {\it Maple V Language Reference Manual}
    (Springer, 1991).
\bibitem{VEGAS}
  G.P. Lepage, \jcp{27}{1978}{192}.
\bibitem{pvegas}
   R. Kreckel, \cpc{106}{1997}{258}.
\bibitem{Har:diss} 
  R. Harlander, Ph.~D.~thesis, University of Karlsruhe
  (Shaker Verlag, Aachen, 1998).
\bibitem{geficom}
  K.G. Chetyrkin and M. Steinhauser, unpublished.
\bibitem{minos}
  T. van Ritbergen, J.A.M. Vermaseren, S.A. Larin, and P. Nogueira,
  \ijmpc{6}{1995}{513};\\
  J.A.M. Vermaseren, \nima{389}{1997}{350}.
\bibitem{bubbles}
  T. van Ritbergen, unpublished.
\bibitem{color}
  T. van Ritbergen, A.N. Schellekens, and J.A.M. Vermaseren,
  \ijmpa{14}{1999}{41}.
\bibitem{grace}
  T. Kaneko {\it et al.}, in: {\it New Computing Techniques in Physics
    Research II}, ed. D. Perret-Gallix (World Scientific, Singapore,
    1992) 659;\\ T. Ishikawa {\it et al.}, {\it GRACE Manual}, KEK
    Rep.~No.\ 92-19 (1993).
\bibitem{Jim95}
  M. Jimbo, Minami-Tateya collaboration, {\it JLC Workshop} 1995:0098-107.
\bibitem{CHANEL}
  H. Tanaka, \cpc{58}{1990}{153};\\
  H. Tanaka {\it et al.}, \cpc{64}{1991}{149}.
\bibitem{BASES/SPRING}
  S. Kawabata, \cpc{41}{1986}{127}; \ibid{88}{1995}{309}.
\bibitem{tlamm}
  L.V. Avdeev, J. Fleischer, M.Yu. Kalmykov, and M.N. Tentyukov,
  \nima{389}{1997}{343}; \cpc{107}{1997}{155}.
\bibitem{diana}
  L.V. Avdeev, J. Fleischer, M.Yu. Kalmykov, and M.N. Tentyukov,
  \cpc{107}{1997}{155};\\
  J. Fleischer, M. Tentyukov, and O.L. Veretin, \app{28}{1997}{2333}.
\bibitem{HELAS} 
  E. Murayama, I. Watanabe, and K. Hagiwara, KEK Report 91-11, Jan.\ 1992.
\bibitem{HEPLoops}
  L.R. Surguladze, Rep.~No.~FERMILAB-PUB-92-191-T (1992);\\
  L.R. Surguladze, \ijmpc{5}{1994}{1089}.
\bibitem{lanhep}
  A.V. Semenov, \nima{389}{1997}{293};\\
  A.V. Semenov, {\it LanHEP -- a package for automatic generation of
    Feynman rules from the Lagrangian}, Rep.~No.~INP~MSU~98-2/503.
\bibitem{LOOPS}
  L.R. Surguladze and F.V. Tkachov, \cpc{55}{1989}{205}.
\bibitem{MadGraph}
  T. Stelzer and W.F. Long, \cpc{81}{1994}{357}. 
\bibitem{oneloop}
  L. Br\"ucher, J. Franzkowski, and D. Kreimer, \cpc{85}{1995}{153};\\
  \cpc{107}{1997}{281}.
\bibitem{phact} A. Ballestrero, Torino preprint, in preparation.
\bibitem{recursor}
  D. Broadhurst, unpublished.
\bibitem{sixphact}
  E. Accomando, A. Ballestrero, and M. Pizzio, \npb{512}{1998}{19}.
\bibitem{slicer}
  D. Broadhurst, unpublished.
\bibitem{MerSch98}
  R. Mertig and R. Scharf, \cpc{111}{1998}{265}.
\bibitem{tracer}
  M. Jamin and M.E. Lautenbacher, \cpc{74}{1993}{265}.
\bibitem{NumRecBook}
  W.H. Press, S.A. Teukolsky, W.T. Vetterling, and B.P. Flannery,
  {\it ``Numerical Recipes in Fortran''}, Cambridge University Press
  (Cambridge, 1992).
\bibitem{wphact} E. Accomando and A. Ballestrero, \cpc{99}{1997}{270}.
\bibitem{pukhov}
  A.E. Pukhov, private communication.
\bibitem{KalSab55} G. K\"allen and A. Sabry, {\it
    K. Dan. Videnk. Selsk. Mat.-Fys. Medd.} {\bf 29} (1955) No.~17;\\
  see also:
  J. Schwinger, {\it Particles, Sources and Fields}, Vol.~II,
  (Addison-Wesley, New York, 1973).
\bibitem{BarRem73}
  R. Barbieri and E. Remiddi, \nca{13}{1973}{99}; (E)~\ibid{A 13}{1973}{99}.
\bibitem{Kni90}
  B.A. Kniehl, \npb{347}{1990}{86}.
\bibitem{BroFleTar93}
  D.J. Broadhurst, J. Fleischer, and O.V. Tarasov, \zpc{60}{1993}{287}.
\bibitem{HoaKueTeu95}
  A.H. Hoang, J.H. K\"uhn, and T. Teubner, \npb{452}{1995}{173}.
\bibitem{Hoadiss} A.H. Hoang, Ph.~D.~thesis, University of Karlsruhe
  (Shaker Verlag, Aachen, 1996).
\bibitem{CheHarSte98} K.G. Chetyrkin, R. Harlander, and M. Steinhauser,
  \prd{58}{1998}{014012}.
\bibitem{ckk96} 
  K.G. Chetyrkin, J.H. K\"uhn, and A. Kwiatkowski, \prc{277}{1996}{189}.
\bibitem{chkst98} 
  K.G. Chetyrkin, A.H. Hoang, J.H. K\"uhn, M. Steinhauser, and T. Teubner,
  \epjc{2}{1998}{137}.
\bibitem{BaiBro95}
  P.A. Baikov and D.J. Broadhurst,
  {\it 4th International Workshop on Software Engineering and
  Artificial Intelligence for High Energy and Nuclear Physics (AIHENP95)},
  Pisa, Italy, 3-8 April 1995.
  Published in Pisa AIHENP (1995) 167.
\bibitem{CheHarKueSte96} 
  K.G. Chetyrkin, R. Harlander, J.H. K\"uhn, and
  M. Steinhauser, \nima{389}{1997}{354}.
\bibitem{CheHarKueSte97}
  K.G. Chetyrkin, R. Harlander, J.H. K\"uhn, and M. Steinhauser,
  \npb{503}{1997}{339}.
\bibitem{AkhBarRie86}
  A. Akhundov, D. Bardin, and T. Riemann, \npb{276}{1986}{1};\\
  J. Bernabeu, A. Pich, and A. Santamaria, \plb{200}{1988}{569};\\
  B.W. Lynn and R.G. Stuart, \plb{252}{1990}{676}.
\bibitem{BeeHol88}
  W. Beenakker and W. Hollik, \zpc{40}{1988}{141}.
\bibitem{CzaKue96}
  A. Czarnecki and J.H. K\"uhn, \prl{77}{1996}{3955}; 
  (E) \ibid{80}{1998}{893}.
\bibitem{FleJegRacTar92}
  J. Fleischer, F. Jegerlehner, P. R\c{a}czka and O.V. Tarasov,
  \plb{293}{1992}{437};\\
  G. Buchalla and A. Buras, \npb{398}{1993}{285};\\
  G. Degrassi, \npb{407}{1993}{271}.
\bibitem{CheKwiSte93} 
  K.G. Chetyrkin, A. Kwiatkowski and M. Steinhauser, \mpl{8}{1993}{2785}.
\bibitem{KwiSte95}
  A. Kwiatkowski and M. Steinhauser, \plb{344}{1995}{359}.
\bibitem{Per95}
  S. Peris and A. Santamaria, \npb{445}{1995}{252}.
\bibitem{YelRep95}
  D. Bardin {\it et al.},
  {\it Reports of the working group on precision calculations for the
    $Z$ resonance},
  D. Bardin, W. Hollik, G. Passarino, (eds.),
  CERN 95-03, 31 Mar 1995.
\bibitem{Klu75}
  H. Kluberg-Stern and J.B. Zuber, \prd{12}{1975}{467};\\
  N.K. Nielsen, \npb{97}{1975}{527}; \npb{120}{1977}{212}.
\bibitem{Spi84}
  V.P. Spiridonov,  Rep.~No.~INR~P--0378 (Moscow, 1984).
\bibitem{CheKniSte97hbb}
  K.G. Chetyrkin, B.A. Kniehl, and M. Steinhauser,
  \prl{78}{1997}{594}; \npb{490}{1997}{19}.
\bibitem{CheKniSte97hgg}
  K.G. Chetyrkin, B.A. Kniehl, and M. Steinhauser, \prl{79}{1997}{353}.
\bibitem{CheKniSteBar98}
  K.G. Chetyrkin, B.A. Kniehl, M. Steinhauser, and W.A. Bardeen,
  \npb{535}{1998}{3}.
\bibitem{CheKniSte98dec}
  K.G. Chetyrkin, B.A. Kniehl, and M. Steinhauser, \npb{510}{1998}{61}.
\bibitem{Che97higgs}
  K.G. Chetyrkin, \plb{390}{1997}{309}.
\bibitem{Vla80CheKatTka80}
  A.A. Vladimirov, \tmf{43}{1980}{210};\\
  K.G. Chetyrkin, A.L. Kataev, and F.V. Tkachov, \npb{174}{1980}{345}.
\bibitem{CheSmi84}
  K.G. Chetyrkin and F.V. Tkachov, \plb{114}{1982}{340};\\
  K.G. Chetyrkin and V.A. Smirnov, \plb{144}{1984}{419}.
\bibitem{Che97radcor96}
  K.G. Chetyrkin, \app{28}{1997}{725}.
\bibitem{CheSte97}
  K.G. Chetyrkin and M. Steinhauser, \plb{408}{1997}{320}.
\bibitem{Kat97}
  A.L. Kataev and V.T. Kim, Rep.~No.\ ENSLAPP-A-407-92, hep-ph/9304282
  (1993);\\
  A.L. Kataev, \jetp{66}{1997}{327}.
\bibitem{KniSte95}
  B.A. Kniehl and M. Steinhauser, \npb{454}{1995}{485}; \plb{365}{1996}{297}.
\bibitem{Acc97}
  E. Accomando {\it et al.}~(ECFA/DESY LC Physics Working Group), 
  \prc{299}{1998}{1}.
\bibitem{MarSir80}
  A. Sirlin, \prd{22}{1980}{971};\\
  W.J. Marciano and A. Sirlin, \prd{22}{1980}{2695}; 
  (E)~\ibid{D 31}{1985}{213}.
\bibitem{DegGamVic96}
  G. Degrassi, P. Gambino, and A. Vicini, \plb{383}{1996}{219}.
\bibitem{DegGamSir97}
  G. Degrassi, P. Gambino, and A. Sirlin, \plb{394}{1997}{188}.
\bibitem{DegGamPasSir98}
  G. Degrassi, P. Gambino, M. Passera, and A. Sirlin, \plb{418}{1998}{209}.
\bibitem{WeiBarc98}
  G. Weiglein, Proceedings of the {\it IVth Int.\ Symp.\ on Radiative
  Corrections}, Barcelona, Sept.~8-12, 1998.
\bibitem{GamBarc98}
  P. Gambino, Proceedings of the {\it IVth Int.\ Symp.\ on Radiative
  Corrections}, Barcelona, Sept.~8-12, 1998.
\bibitem{WeiRhein98}
  G. Weiglein, \app{29}{1998}{2735}.
