Positive solutions for nonlinear m-point boundary value problems of dirichlet type via fixed-point index theory. - Ruyun Ma; Lishun Ren (Appl. Math. Lett., 2003)

An SEIV Epidemic Model for Childhood Diseases with Partial Permanent Immunity. - Mei Bai; Lishun Ren (Comput. Math. Methods Medicine, 2015)