by Obʺedinennyĭ institut i︠a︡dernykh issledovaniĭ (Dubna, Chekhovskiĭ raĭon, Russia), Ukraine) Mezhdunarodnoe soveshchanie po problemam kvantovoĭ teorii poli︠a︡. (6th 1981 Alushta, N. N. Bogoli︠u︡bov, G. I. Kolerov, V. V. Nesterenko