by (United States)T.Aubin;by (USSR)A.V.Bitsadze; by (United States)J.Bass;by (USSR)A.V.Efimov; by (United States)R.Ruffni;by (USSR)A.A.Logunov; by (United States)A.Ghatak;by (USSR)A.K.Ghatak; by (United States)T.Jech;by (USSR)K.Kuratowski; by (United States)R.E.Dodd;by (USSR)Y.V.Khodakov; by (United States)S.Scull;by (USSR)A.Starkov; by (United States)L.Pisk;by (USSR)C.Stanislasik; by (United States)O.Svelto;by (USSR)L.V.Tarasov; by (United States)G.J.Gottling;by (USSR)A.M.Kugushev;