000 00343nam a2200133Ia 4500
008 221001s1972 xx 000 0 eng d
082 _a512.7 BEH
100 _aBehrens, Ernst-August
245 0 _aRing theory
260 _aNew York
_bAcademic Press
_c1972
300 _avii, 320p.
440 _aPure and Applied Mathematics
942 _2ddc
_cBK
999 _c48054
_d48054