00354nam a2200121Ia 4500082001900000100002000019245004700039260004800086300002800134490006000162500000500222700000500227  a511.6bL255.SD  aLender, Eric S.  aSymmetric designs; an algebraic approachb  aCambridgebCambridge University Pressc1983  axii, 306p. Index, Bibl.  aLondon Mathematical society lecture note seriesv v. 74  a  a