Some theorems on existence and uniqueness of fixed points for decreasing operators. - Qianqiao Guo; Pengcheng Niu (Comput. Math. Appl., 2009)

Existence of solutions for 2mth-order periodic boundary value problems. - Xiaojing Feng; Pengcheng Niu; Qianqiao Guo (Appl. Math. Comput., 2011)

Existence of positive solutions to integral equations with weights. - Qianqiao Guo; Qian Wang (Appl. Math. Lett., 2020)