11 citations · 21 across the 5 of their papers we have counts for
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hep-ph1998
Non-perturbative energy levels of two-fermion bound states
Viktor Hund, Hartmut Pilkuhn
For the S-states of positronium and muonium, the terms of an expansion of energy levels in powers of the fine structure constant are also members of a "recoil series". The firs…
hep-ph1998★ 10 cited
Eight-component two-fermion equations
Ruth Haeckl, Viktor Hund, Hartmut Pilkuhn
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 posi…