00489nam a22002057a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001400102100001600116245003500132260003600167300001100203490002200214650002500236830002200261CHAP20220329134543.0971013s1971            r     00010     d  a22103  a23075  a27170  cCHAP  a512.4bC600aCohn, P. M.  aFree rings and their relations  aLondon :bAcademic Press,c1971  a346 p.  aL.M.S. monographs14aAnillos algebraicos.0 aL.M.S. monographs