by (Federal Republic of Germany)B-O.Kuppers;by (USSR)I.S.Dmitriev; (United States)B.Pullman;by (Federal Republic of Germany)B-O.Kuppers; by (USSR)A.Kurosh;by (Federal Republic of Germany)M.Karoubi; by (Federal Republic of Germany)B.Bartok;by (USSR)S.Prokofiev; by (United States)D.Gorenstein;by (Federal Republic of Germany)B.Huppert; by (Denmark)R.Engelking;by (Federal Republic of Germany)H.Federer;