by (USSR)Nikolai Tolstoy;by (United States)Lee Edson; by (USSR)S.Tolansky;by (United States)R.D.Juday; by (USSR)A.V.Efimov;by (United States)M.Mandl; by (USSR)C.Kosniowski;by (United States)W.S.Massey; by (USSR)K.Kuratowski;by (United States)L.P.Maher; by (USSR)N.L.Glinka;by (United States)D.Henderson; by (USSR)N.B.Vasllyev;by (United States)L.C.Washington; by (USSR)A.Simonova;by (United States)Dean R.Snow; by (USSR)C.Stanislasik;by (United States)R.Buckle; by (USSR)V.Kostomarov;by (United States)B.Lott;