by (USSR)G.Karpilovsky;by (United Kingdom)H.Matsumura; by (USSR)A.Yariv;by (United Kingdom)J.M.Ziman; by (USSR)M.Moshinsky; (United Kingdom)C.Nash; by (USSR)A.Starkov;by (United Kingdom)A.Sharp; by (USSR)M.L.Krasnov;by (United Kingdom)L.M.Delves; by (USSR)M.Vygodsky;by (United Kingdom)J.L.Bell; by (USSR)V.A.Ugarov;by (United Kingdom)C.M.Will; by (USSR)G.A.Sudzilovstij;by (United Kingdom)P.R.Webb; by (USSR)Ya.A.Smorodinsky;by (United Kingdom)C.Taylor; by (USSR)I.E.Irodov;by (United Kingdom)K.F.Riley;