by (United Kingdom)J.J.O'Keefe;by (USSR)N.B.Zucova; by (United Kingdom)B.R.Nanda;by (USSR)G.E.Pavlova; by (United Kingdom)J.L.Bell;by (USSR)W.Marek; by (United Kingdom)C.Swatridge;by (USSR)F.B.Kedrov; by (United Kingdom)J.V.Grabiner;by (USSR)N.B.Vasllyev; by (United Kingdom)J.E.Baird;by (USSR)G.B.Antrushina; by (United Kingdom)L.W.Johnson;by (USSR)N.V.Kopchenova; by (United Kingdom)J.L.Matin;by (USSR)E.Prugovecki; by (United Kingdom)R.Best;by (USSR)R.Baker; by (United Kingdom)H.J.Goldsmid;by (USSR)A.M.Prokhorov;