Miriam Sosa-Díaz and  Faustino Sánchez-Garduño,  A Qualitative Description of the Dynamics in the Interactions between Three Populations: Pollinators, Plants, and Herbivores.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2016, vol. 114(6). 307 - 324
    [viewed 08 December 2019]. Available from: https://publications.waset.org/pdf/10004763.