by (USSR)I.S.Dmitriev;by (United Kingdom)P.W.Atkins; by (USSR)Yu.A.Amenzade;by (United Kingdom)R.J.Atkin; by (USSR)I.V.Savelyev;by (United Kingdom)T.K.Aun; by (USSR)I.V.Petrynov;by (United Kingdom)J.G.Stark; by (USSR)A.Yariv;by (United Kingdom)J.M.Ziman; by (USSR)I.S.Dmitriev;by (United States)J.A.Kerr; by (USSR)I.E.Irodov;by (United Kingdom)K.F.Riley; by (USSR)V.A.Ugarov;by (United Kingdom)C.M.Will; by (USSR)H.M.Srivastava;by (United Kingdom)K.Rektorys; by (USSR)K.Spidchenke;by (United Kingdom)T.R.Williams;