Boyce, William E. Elementary differential equations and boundary value problems / William E. Boyce, Richard C. Di Prima. - 9th ed. - Hoboken, NJ : John Wiley & Sons, c2010 - xix, 796 p. : ill. ; 26 cm. ISBN: 9780470398739 (pbk.) Subjects--Topical Terms: Differential equations. Boundary value problems.