by (United Kingdom)I.R.Sinclair;by (USSR)I.V.Savelyev; by (United Kingdom)J.L.Bell;by (USSR)W.Marek; by (United Kingdom)B.R.Nanda;by (USSR)G.E.Pavlova; by (United Kingdom)G.J.WHITROW;by (USSR)I.FROLOV; by (United Kingdom)I.Sinclair;by (United States)P.Bishop; by (United Kingdom)J.J.O'Keefe;by (USSR)N.B.Zucova; by (United Kingdom)L.W.Giggins;by (USSR)A.Y.Lebedeva; by (United Kingdom)R.Best;by (USSR)R.Baker; by (United Kingdom)J.V.Grabiner;by (USSR)N.B.Vasllyev; by (United Kingdom)C.Swatridge;by (USSR)F.B.Kedrov;