by (USSR)I.L.Bim;by (Federal Republic of Germany)H.Stalb; by (Federal Republic of Germany)A.Levy;by (United Kingdom)A.Dodd; by (Federal Republic of Germany)H.Boll;by (United States)H.Insen; by (France)P.Samuel;by (Federal Republic of Germany)H.Zassehaus; by (Federal Republic of Germany)H.Federer;by (United States)G.Kothe; by (Denmark)R.Engelking;by (Federal Republic of Germany)H.Federer; by (Federal Republic of Germany)H.Bottger;by (United States)H.Shapley; by (Federal Republic of Germany)H.Zassehaus;by (United Kingdom)A.Baker; by (Federal Republic of Germany)H.A.Bartels;by (United States)D.C.Harris;