Zill, Dennis G. Cullen, Michael R. Differential equations with boundary-vary problems / by Dennis G. Zill, Michael R. Cullen - 7th ed. - Australia Brooks/Cole, Cengage Learning 2009 - 323 p. ISBN: 9780495383161 Subjects--Topical Terms: Differential equations Dewey Class. No.: 515.35 / ZIL