00342nam a2200133Ia 4500082001700000100001900017245003900036260003400075300001900109490006300128500000500191700000500196856000700201  a512bH861.FS  aHowie, John M.  aFundamentals of semigroup theoryb  aOxfordbClarendon Pressc1995  ax, 351p. Index  aLondon Mathematical Society monographs new series v no.12  a  a  df