On an open problem concerning an integral inequality. Liu, Wenjun; Li, Chuncheng; Dong, Jianwei — 2007 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Further generalization of some double integral inequalities and applications. Liu, Wenjun; Li, Chuncheng; Hao, Yongmei — 2008 Acta Mathematica Universitatis Comenianae. New Series