Ying Wang and Ziheng Zhang 2017. Homoclinic Solutions for Some Nonperiodic Fourth Order Differential Equations with Sublinear Nonlinearities. Journal of Advances in Applied & Computational Mathematics. 4, 1 (Dec. 2017), 15–22. DOI:https://doi.org/10.15377/2409-5761.2017.04.3.