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Relativistic effects in protonium

Discusses relativistic corrections to the hadronic energy shifts in protonium. The main effect in the low-energy system was found to be due to a 2 pi -exchange potential, which modifies the medium-range behaviour of the NN interaction considerably. In view of the application to heavier antiprotonic atoms the author has checked the validity of the Born approximation for the hadronic interaction in various states of protonium.