Elementary differential equations

Discrete mathematics Parashar, B. P. Solution of initial-value problems using fourth order multi-step methods Kalim-ul-Haq Tariq Partial differential equations and their applications Rodino, Luigi Differential equations Mittal, S. K. Partial differential equations Mittal, S. K. Elements of ordinary differential equations Roy, J. Sinha An introduction to oridinary differential equations Coddington, Earl A. Elementary partial differential equations for engineers and scientists Wilhoit, J. C.