Marwan, M., Tuwankotta, J. M., & Harjanto, E. (2018). Application of Lagrange Multiplier Method for Computing Fold Bifurcation Point in A Two-Prey One Predator Dynamical System. Journal of the Indonesian Mathematical Society, 24(2), 7–19. https://doi.org/10.22342/jims.24.2.595.7-19