Kiran, D. R., and B. R. Reddy. “Stability of a Three Species Ecological System Consisting of Prey- Predator Species and a Third Species Which Is a Host to the Prey and Enemy to the Predator”. Journal of Experimental Sciences, vol. 3, no. 2, June 2012, https://www.updatepublishing.com/journal/index.php/jes/article/view/1921.