On the relationship between cyclic and hierarchical three-species predator-prey systems and the two-species Lotka-Volterra modelQ. He, U.C. Täuber and R.K.P. ZiaEur. Phys. J. B, 85 4 (2012) 141DOI: https://doi.org/10.1140/epjb/e2012-20918-4