Conrad, Bruce P. Differential equations : a systems approach / Bruce P. Conrad. - Upper Saddle River, NJ : Prentice Hall, c2003. - 1 v. (various pagings) : ill. ; 25 cm. ISBN: 9780130460264 Subjects--Topical Terms: Differential equations. LC Class. No.: QA372 / .C6416 2003 Dewey Class. No.: 515/.35