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+====== TTP97-07 Eight-component two-fermion equations ======
+<hidden TTP97-07  Eight-component two-fermion equations > An eight-component formalism is proposed for the relativistic two-fermion
+ problem. In QED, it
+ extends the applicability of the Dirac equation with hyperfine interaction to
+ the positronium case.
+ The use of exact relativistic
+ two-body kinematics entails a CP-invariant spectrum which is symmetric in
+ the total cms energy. It
+ allows the extension of recent $\alpha^6$ recoil corrections to the positronium
+ case, and
+ implies new recoil corrections to
+ the fine and hyperfine structures and to the Bethe logarithm.
+ </hidden>
+|**R. H\"ackl, V. Hund and H. Pilkuhn**  |
+|** Phys. Rev. A57 3268 1998  **  |
+| {{preprints:1997:ttp97-07.pdf|PDF}} {{preprints:1997:ttp97-07.ps|PostScript}}   |
+| |