Sharma, J.N.. Differential Equations / Textual Documents J.N.Sharma & R.K.Gupta. - 19th Rev.ed / - Meerut : Krishna Prakashan Mandir , 1991. - 479p. : ill ; 22cm . Subjects--Index Terms: Differential Equations Mathematics G-Mathematics Dewey Class. No.: 515.35 / Sh 11 Di