00305    a2200109   4500020001500000082001500015100002600030245004200056260005100098300002100149650002500170  a8120327217  a511.2bBIS  aBiswal, Purna Chandra  aDiscrete mathematics and graph theory  aNew DelhibPrentice- Hall of Indiac2005g2005  axv, 364p.c25cm.  aMathematical systems