\begin{thebibliography}{10}
\providecommand{\url}[1]{\texttt{#1}}
\providecommand{\urlprefix}{URL }
\providecommand{\eprint}[2][]{\url{#2}}

\bibitem{Kuhn:2007vp}
J.~H. {K\"uhn}, M.~Steinhauser, C.~Sturm.
\newblock \emph{Nucl. Phys.}, B778:192--215, 2007.
\newblock \eprint{hep-ph/0702103}.

\bibitem{Novikov:1977dq}
V.~A. Novikov, et~al.
\newblock \emph{Phys. Rept.}, 41:1--133, 1978.

\bibitem{Reinders:1985sr}
{L. J. Reinders, H. Rubinstein, S. Yazaki}.
\newblock \emph{Phys. Rept.}, 127:1, 1985.

\bibitem{Colangelo:2000dp}
P.~Colangelo, A.~Khodjamirian.
\newblock 2000.
\newblock \eprint{hep-ph/0010175}.

\bibitem{Ioffe:2005ym}
B.~L. Ioffe.
\newblock \emph{Prog. Part. Nucl. Phys.}, 56:232--277, 2006.
\newblock \eprint{hep-ph/0502148}.

\bibitem{:2008hx}
B.~Aubert, et~al.
\newblock \emph{Phys. Rev. Lett.}, 102:012001, 2009.
\newblock \eprint{arXiv 0809.4120}.

\bibitem{Kuhn:2001dm}
J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{Nucl. Phys.}, B619:588--602, 2001.
\newblock \eprint{hep-ph/0109084}.

\bibitem{Kuhn:2002zr}
J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{JHEP}, 10:018, 2002.
\newblock \eprint{hep-ph/0209357}.

\bibitem{Chetyrkin:1995ii}
K.~G. Chetyrkin, J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{Phys. Lett.}, B371:93--98, 1996.
\newblock \eprint{hep-ph/9511430}.

\bibitem{Chetyrkin:1996cf}
K.~G. Chetyrkin, J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{Nucl. Phys.}, B482:213--240, 1996.
\newblock \eprint{hep-ph/9606230}.

\bibitem{Chetyrkin:1997mb}
K.~G. Chetyrkin, J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{Nucl. Phys.}, B505:40--64, 1997.
\newblock \eprint{hep-ph/9705254}.

\bibitem{Boughezal:2006uu}
R.~Boughezal, M.~Czakon, T.~Schutzmeier.
\newblock \emph{Nucl. Phys. Proc. Suppl.}, 160:160--164, 2006.
\newblock \eprint{hep-ph/0607141}.

\bibitem{Maier:2007yn}
A.~Maier, P.~{Maierh\"ofer}, P.~Marquard.
\newblock \emph{Nucl. Phys.}, B797:218--242, 2008.
\newblock \eprint{arXiv 0711.2636}.

\bibitem{Chetyrkin:2006xg}
K.~G. Chetyrkin, J.~H. {K\"uhn}, C.~Sturm.
\newblock \emph{Eur. Phys. J.}, C48:107--110, 2006.
\newblock \eprint{hep-ph/0604234}.

\bibitem{Boughezal:2006px}
R.~Boughezal, M.~Czakon, T.~Schutzmeier.
\newblock \emph{Phys. Rev.}, D74:074006, 2006.
\newblock \eprint{hep-ph/0605023}.

\bibitem{Maier:2008he}
A.~Maier, P.~{Maierh\"ofer}, P.~Marquard.
\newblock \emph{Phys. Lett.}, B669:88--91, 2008.
\newblock \eprint{arXiv 0806.3405}.

\bibitem{Maier:2009}
A.~Maier, P.~{Maierh\"ofer}, P.~Marquard, A.~V. Smirnov.
\newblock 2009.
\newblock \eprint{arXiv 0907.2117}.

\bibitem{Kiyo:2009}
Y.~Kiyo, A.~Maier, P.~{Maierh\"ofer}, P.~Marquard.
\newblock 2009.
\newblock \eprint{arXiv 0907.2120}.

\bibitem{Hoang:2008qy}
A.~H. Hoang, V.~Mateu, S.~Mohammad~Zebarjad.
\newblock \emph{Nucl. Phys.}, B813:349--369, 2009.
\newblock \eprint{arXiv 0807.4173}.

\bibitem{Besson:1984bd}
D.~Besson, et~al.
\newblock \emph{Phys. Rev. Lett.}, 54:381, 1985.

\bibitem{PDG}
{C. Amsler et al. (Particle Data Group)}.
\newblock \emph{Phys. Lett,}, B667:1, 2008.

\bibitem{Chetyrkin:1996tz}
K.~G. Chetyrkin, J.~H. {K\"uhn}, T.~Teubner.
\newblock \emph{Phys. Rev.}, D56:3011--3018, 1997.
\newblock \eprint{hep-ph/9609411}.

\bibitem{Jadach:1988gb}
S.~Jadach, B.~F.~L. Ward.
\newblock \emph{Comput. Phys. Commun.}, 56:351--384, 1990.

\bibitem{Harlander:2002ur}
R.~V. Harlander, M.~Steinhauser.
\newblock \emph{Comput. Phys. Commun.}, 153:244--274, 2003.
\newblock \eprint{hep-ph/0212294}.

\bibitem{Chetyrkin:2000yt}
K.~G. Chetyrkin, J.~H. {K\"uhn}, M.~Steinhauser.
\newblock \emph{Comput. Phys. Commun.}, 133:43--65, 2000.
\newblock \eprint{hep-ph/0004189}.

\bibitem{Sturm:2008eb}
C.~Sturm.
\newblock \emph{JHEP}, 09:075, 2008.
\newblock \eprint{arXiv 0805.3358}.

\bibitem{Allison:2008xk}
I.~Allison, et~al.
\newblock \emph{Phys. Rev.}, D78:054513, 2008.
\newblock \eprint{arXiv 0805.2999}.

\end{thebibliography}
