Allee Effect in Gause Type Predator-Prey Models: Existence of Multiple Attractors, Limit cycles and Separatrix Curves. A Brief ReviewE. González-Olivares and A. Rojas-PalmaMath. Model. Nat. Phenom., 8 6 (2013) 143-164DOI: https://doi.org/10.1051/mmnp/20138610