Rajesh Kumar Shukla, Dinesh Kumar, and Puneet Sapra. “A Note on Fractional Order N-Species Lotka Volterra Competitive System With Delay”. Journal of International Academy of Physical Sciences, vol. 21, no. 2, June 2017, pp. 123-9, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/450.