Omollo, Emily Atieno, and George Kimathi. “Formulation of a Mathematical Model for the Transmission Dynamics of Infectious Bursal Disease (IBD), Incorporating Eects of Environmental Factors”. Asian Research Journal of Mathematics 16, no. 9 (August 21, 2020): 20-35. Accessed April 12, 2021. https://journalarjom.com/index.php/ARJOM/article/view/30217.