Xiang , ChuangLu , Ming and Huang , Jicai. (2021). Bogdanov-Takens Bifurcation in a Host-Parasitoid Model.
            <i>Journal of Nonlinear Modeling and Analysis</i>. <i>2</i> (2).
            173-185.
         doi:10.12150/jnma.2020.173