00336nam a2200121Ia 4500008004100000082001700041100002200058245003000080250000800110260004000118300002000158490003600178260420b        |||||||| |||| 00| 0 eng d  a516bC879.NG  aCoxeter, H. S. M.  aNon-euclidean geometryb/  a5th  aToronto:bToronto University,c1968  axv, 309p. Index  aMathematical expositionsvno. 2