Ahsan, Zafar. Differential equations and their applications / Zafar Ahsan. - New Delhi : Prentice Hall of India , 1999. - x,442p. : ills.,fig.,dig. ; 25cm . NULL ISBN: 8120314972 Rs. 225.00 Subjects--Index Terms: DIFFERENTIAL EQUATIONS Dewey Class. No.: 515.35 / AHS/D