The following publications are possibly variants of this publication:
- Positive solutions of second-order m-point boundary value problems with changing sign singular nonlinearityXinguang Zhang, Huichao Zou, Lishan Liu. appml, 20(6):629-636, 2007. [doi]
- Positive solutions of a nonlinear three-point boundary value problemBing Liu. amc, 132(1):11-28, 2002. [doi]
- Multiple positive solutions for a system of impulsive integral boundary value problems with sign-changing nonlinearitiesXinan Hao, Mingyue Zuo, Lishan Liu. appml, 82:24-31, 2018. [doi]
- Nontrivial solutions for higher-order m-point boundary value problem with a sign-changing nonlinear termLishan Liu, Bingmei Liu, Yonghong Wu. amc, 217(8):3792-3800, 2010. [doi]