00494nam a2200133Ia 4500082001600000100009300016245009000109260004800199300001600247440006000263500000500323653000600328700002600334  a511.6bB826  aBritish Combinatorial Conference on Surveys in Combinatorics, Univ. of Surrey, July 1991  aSurveys in combinatorics; proceedings of the 13th conferencebcEd. by A. D. Keedwell  aCambridgebCambridge University Pressc1991  aviii, 300p.  aLondon Mathematical society lecture note seriesvv. 166  a  a   aKeedwell, A. D. ; ed.