, D. A. S. K. M. S. P. H. D. S. R. G. “Optimal Control of an Influenza Model With Multiple Control Strategies”. International Journal on Recent Trends in Life Science and Mathematics, vol. 3, no. 6, June 2016, pp. 01-07, https://ijlsm.org/index.php/ijlsm/article/view/75.