1. DeLisi, C., Rescigno, A.: Immune surveillance and neoplasia–I. A minimal mathematical model. Bull. Math. Biol. 39, 201–221 (1977)
2. Kuznetsov, V.A., Makalkin, I.A., Taylor, M.A., Perelson, A.S.: Nonlinear dynamics of immunogenic tumors: parameter estimation and global bifurcation analysis. Bull. Math. Biol. 56, 295–321 (1994)
3. Galach, M.: Dynamics of the tumor–immune system comptition–the effect of time delay. Int. J. Appl. Math. Comput. Sci. 13, 395–406 (2003)
4. Rihan, F.A., Safan, M., Abdeen, M.A., Abdel-Rahman, D.: Qualitative and computational analysis of a mathematical model for the tumor-immune interactions. J. Appl. Math. 2012, 19 (2012)
5. Dong, Y., Miyazaki, R., Takeuchi, Y.: Mathematical modeling on helper T cells in a tumor immune system. Discret. Contin. Dyn. Syst.-B 19, 55–72 (2014)