00291nam a2200121Ia 4500008004100000041001200041082001600053100001500069245002700084260003100111300000800142650001900150221030s9999 xx 000 0 und d aEnglish a105.23bBal aN. P. Bali 0aDifferential Equations bLaxmi PubaNew Delhic1999 a491 aBE Mathematics