by D.Visconti;by (United Kingdom)E.J.Wenham; by D.H.Howe;by (United Kingdom)D.M.R.Hutchcroft; by (USSR)V.Lakshmikantham;by (United Kingdom)E.T.Copson; by (United Kingdom)J.Seidl;by (United Kingdom)A.J.Worrall; by (United States)M.D.Scadron;by (United Kingdom)E.H.Wichmann; by (United Kingdom)L.Lerner;by (United Kingdom)B.C.Southam; by (United Kingdom)A.Corney;by (United Kingdom)E.U.Condon; by (United Kingdom)E.Miner;by (United Kingdom)R.T.Jones;