1. Systémes grossiers;Andronov;C.R. (Dokl.) Acad. Sci. U.S.S.R.,1937
2. Theory of bifurcations of dynamic systems on a plane;Andronov,1967
3. Populations modelling by higher order differential equations;Bojadziev,1983
4. Lotka-Volterra model controlled by small perturbations;Bojadziev;Proc. Inst. AMSE Conf. “Modelling and Simulation”, Athens,1984
5. The second derivative and population modelling;Clark;Ecology,1971