by (United States)D.E.Ostenrock;by (United States)P.Halpern; by (United States)R.Osborn;by (United States)P.Hall; by (United States)O.K.Friedrichs;by (United States)P.R.Halmos; by (United States)D.C.Harris;by (United States)J.Hinze; by (United States)D.D.Nichloas;by (United States)D.Acker; by (United States)D.K.Cheng;by (United States)F.E.Dart; by (United States)I.Singer;by (United States)P.R.Halmos; by (United States)N.C.Giri;by (United States)P.E.Green; by (United States)D.Danielson;by (United States)D.Danielson; by (United States)D.M.Hercules;by (United States)P-E.Wenger;