by (United Kingdom)L.W.Giggins;by (USSR)A.Y.Lebedeva; by (United Kingdom)L.W.Johnson;by (USSR)N.V.Kopchenova; by (United Kingdom)I.R.Sinclair;by (USSR)I.V.Savelyev; by (United Kingdom)J.V.Grabiner;by (USSR)N.B.Vasllyev; by (United Kingdom)H.J.Goldsmid;by (USSR)A.M.Prokhorov; by (United Kingdom)B.R.Nanda;by (USSR)G.E.Pavlova; by (United Kingdom)C.Kay;by (USSR)E.A.Kornejeva; by (United Kingdom)C.Swatridge;by (USSR)F.B.Kedrov; by (United Kingdom)J.L.Matin;by (USSR)E.Prugovecki; by (United Kingdom)G.W.Hoffman;by (USSR)J.H.Bater...et al;