by (United Kingdom)C.A.Coppel;by (India)K.P.Bahadur; by (United Kingdom)P.Hammond;by (India)N.S.Khare; by (United Kingdom)C.Embleton;by (India)V.K.Sharma; by (United Kingdom)J.D.Ullman;by (India)B.N.Chakrabarty; by (United Kingdom)L.D.Barron;by (India)G.S.Sobti; by (United Kingdom)A.Copland;by (Austria)J.Strauss; by (United Kingdom)C.L.Youing;by (United States)J.N.Butler; by (United Kingdom)W.A.Coupe...et al;by (United Kingdom)S.M.Sevmour; by (United Kingdom)W.J.Coffey;by (United Kingdom)C.A.M.King; by (United Kingdom)J.K.Neufeld;by (United Kingdom)J.P.B.Allen;