Positive solutions of an elliptic system modeling a population with two age groups. - Ruyun Ma; Ruipeng Chen; Yanqiong Lu (Appl. Math. Comput., 2014)

Method of Lower and Upper Solutions for Elliptic Systems with Nonlinear Boundary Condition and Its Applications. - Ruyun Ma; Ruipeng Chen; Yanqiong Lu (J. Appl. Math., 2014)

Coexistence states of an elliptic system modeling a population with two age groups. - Ruyun Ma; Ruipeng Chen; Yanqiong Lu (Comput. Math. Appl., 2015)