00250nam a2200109Ia 4500008004100000041000800041082001900049100001500068245004000083260000900123300000800132211209s1974    xx            000 0 und d  aeng  a515.33 N74 PIS  aPISKUNOV N  aDIFFERENTIAL AND INTEGRAL CALCULUS   c1974  a472