00306nam a2200121Ia 4500008004100000041001200041082001600053100001500069245004200084260003100126300000800157650001900165221030s9999    xx            000 0 und d  aEnglish  a105.23bBal  aN. P. Bali 0aDifferential Equationscby N. P. Bali  bLaxmi PubaNew Delhic2000  a491  aBE Mathematics