00338nam a2200133 a 450000500170000002000150001708200140003210000150004610000160006124500460007726000430012330000220016663000160018820251202164318.0  a3764317361  a511.bDEL  aDelgado, A  aGoldschmidt  aGroups and Graphs New Results and Methods  aGermanybBirkhauser verlag Baselc1985  a244 p.b22 cm.c_  aMathamatics