00245nam a2200109Ia 4500008004100000041000800041082000800049100001400057245002800071260002800099300000800127211209s1983    xx            000 0 und d  aeng  aBAL  aBALI, N P  aDIFFERENTIAL EQUATIONS   bLAXMI PUBLICATIONc1983  a315