Bai, Zhanbing, Mingfu Ma, and Xiangqian Liang. “Triple Positive Solutions for the One-Dimensional $p$-Laplacian”. Tamkang Journal of Mathematics 37, no. 1 (March 31, 2006): 15–25. Accessed April 27, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/176.