Dynamics of species in a nonautonomous Lotka-Volterra system. Ton, Ta Viet — 2009 Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]
Dynamics of a non-autonomous three-dimensional population system. Quang, Ta Hong; Ton, Ta Viet; Linh, Nguyen Thi Hoai — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]