Upadhyay, R.K.K., Naji, R.K.K. and Kumari, N. (2007) “Dynamical Complexity in Some Ecological Models: Effects of Toxin Production by Phytoplankton”, Nonlinear Analysis: Modelling and Control, 12(1), pp. 123–138. doi:10.15388/NA.2007.12.1.14726.