by (India)R.Srinivasan;by (United Kingdom)M.M.Woolfson; by (United Kingdom)M.L.McGlashan;by (United Kingdom)J.S.Rowlinson; by (USSR)H.M.Srivastava;by (United Kingdom)K.Rektorys; by (United Kingdom)H.G.Widdowson;by (United Kingdom)H.G.Wiwwowson; by (India)L.E.El'sgol'ts;by (United Kingdom)B.D.Hassard; by (USSR)B.N.Srivastava;by (United Kingdom)M.Springford; by (United Kingdom)G.Millerson;by (United Kingdom)W.N.Sproson; by (United Kingdom)R.L.Stevenson;by (United Kingdom)R.L.Stevenson; by (United Kingdom)A.H.Haines;by (United Kingdom)M.J.B.Themson; by (United Kingdom)B.H.Bransden;by (United Kingdom)P.E.Hodgson;