Lingeshwaran, Shangerganesh, Deiva Mani Nallasamy, and Karthikeyan Shanmugasundaram. “Renormalized and Entropy Solutions of Tumor Growth Model With Nonlinear Acid Production”. Mathematical Modelling and Analysis 22, no. 5 (September 21, 2017): 695-716. Accessed July 6, 2020. https://journals.vgtu.lt/index.php/MMA/article/view/922.