Chulin Likasiri. (1994) Analysis of a mathematical model of a food chain by the singular perturbation method. Mahidol University,:ม.ป.ท.Chulin Likasiri. 1994. Analysis of a mathematical model of a food chain by the singular perturbation method. ม.ป.ท.:Mahidol University,;Chulin Likasiri. Analysis of a mathematical model of a food chain by the singular perturbation method. ม.ป.ท.:Mahidol University, 1994. Print.