Aksoy Y.Göktaş U.Pakdemirli M.Dolapçi I.T.2025-04-102025-04-102016http://hdl.handle.net/20.500.14701/48642Perturbation-iteration method is generalized for systems of first order differential equations. Approximate solutions of Lotka-Volterra systems are obtained using the method. Comparisons of our results with each other and with numerical solutions are given. The method is implemented in Mathematica, a major computer algebra system. The package PerturbationIteration.m automatically carries out the tedious calculations of the method. © 2016 Faculty of Engineering, Alexandria University.Article10.1016/j.aej.2016.02.015