00258nam a2200109Ia 4500008004100000082001500041100002300056245001500079250001100094260003600105300000700141190710s9999    xx            000 0 und d  a517.521 Sh  aSharma, Har Swarup 0aSet theory  a3rd ed  aAgrabRam Prasad and Sonsc1985  a76