Yang, ChuanFu. “Reconstruction of the Sturm-Liouville Operators on a Graph With $\delta’_s$ Couplings”. Tamkang Journal of Mathematics 42, no. 3 (August 24, 2011): 329–342. Accessed July 22, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/773.