Ahsan, Zafar . Differential equations and their applications / by Zafar Ahsan. - 2nd ed / - New Delhi : Prentice-Hall of India Pvt. Ltd. , 2004 - 514p ; ISBN: 978-81-203-2523-4 Subjects--Topical Terms: Mathematics- Equations Dewey Class. No.: B33 / P4;1