Prasad, B. H. and Ramacharyulu, N. C. P. (2012) β€œOn the Stability of a Four Species Syn Eco-System with Commensal Prey-Predator Pair with Prey-Predator Pair of Hosts-VI (Normal Steady State)”, MATEMATIKA, 28, pp. 181–192. doi: 10.11113/matematika.v28.n.573.