00311nam a2200121Ia 4500008004100000082001300041100001800054245004000072260001800112300001300130600001700143650002900160140224s9999    xx            000 0 und d  a519.4 L3  aLedermann, W.  aIntroduction to group theory Essex/  bLongmanc1973  avi,176p.  aW. Ledermann  aGroup theory,Mathematics