00261nam a2200109Ia 4500008004100000041000800041082001800049100001300067245001800080260004500098300000800143211209s1988    xx            000 0 und d  aeng  a511.5 N88 HAR  aHARARY F  aGRAPH THEORY   aNEW DELHIbNAROSA PUBLISHING HOUSEc1988  a286