00286nam a2200121Ia 4500008004100000082001500041100002100056245001700077260003500094300001100129942000700140999001700147190709s9999    xx            000 0 und d  a512.86 W63  aWigner, Eugene P 0aGroup theory  aNew yorkbAcademic pressc1959  axi,372  cBK  c41692d41692