Villasana, M. and Ochoa, G. (2004), Heuristic design of cancer chemotherapies, IEEE Transactions of Evolutionary Computation, 8, 513–521.  Villasana, M. and Radunskaya, A. (2003), A delay differential equation of the model for tumor
growth, Journal of Mathematical Biology, 47, 270–294.  Heydari, A., Farahi, M.H. and Heydari, A.A. (2006), Optimal control of treatment of tuberculosis, International Journal of Applied Mathematics, 194, 389-404.  Yafia, R. (2006), Dynamics analysis
and limit cycle in a delayed model for tumor growth with quiescence, Nonlinear Analysis: Modeling and Control, 11, 95–110.  Cojocaru, L. and Agur, Z. (1992), A theoretical analysis of interval drug dosing for cell-cycle-phase-specific drugs, Math. Biosci., 109, 85–97.  Panetta, J.C. and Adam, J. (1995), A mathematical model of cyclespecific chemotherapy, Math. Comput. Modeling, 22(2), 67–82.  Birkhead, B.G., Rakin, E.M., Gallivan, S., Dones, L. and Rubens, R.D. (1987), A mathematical model of the development of drug resistance to cancer chemotherapy, European Journal of Cancer and Clinical Oncology, 23(9), 1421-1427.  Webb, G.F. (1992), A cell population model of periodic chemotherapy treatment, Biomedical Modelling and Simulation, 83-92.  Villasana, M. and Radunskaya, A. (2003), A delay differential equation model for tumor growth, Journal of Mathematical Biology, 47, 270-294.  Villasana, M. (2001), A delay differential equation model for tumor growth, Ph.D.
dissertation, Claremont University, United State of America.  Ghaffari, A. and Nasserifar, N. (2009), Mathematical modeling and Lyapunov based drug administration in cancer chemotherapy, Iranian Journal of Electronical and Electrical Engineering, 5(3), 151-158.  Ghaffari, A., Azizi, K. and Amini, M.R. (2011), Mathematical modelling of Cancer and designing of an optimal
Lyapunov-Based Chemotherapy, Journal of Isfahan Medical School (JIMS) (In Press).  Khalil, H.K. (2002), Nonlinear Systems, 3 rd edition, Prentice-Hall, New York. م