F. R. Motulo, Trisilowati, and I. J. T . R. Tamsih. “Dynamical Analysis of Tumor Growth Model With Immunotherapy”. International Journal of Mathematics And its Applications 7, no. 4 (December 15, 2019): 185–192. Accessed May 6, 2024. http://ijmaa.in/index.php/ijmaa/article/view/219.