Gilewicz, J., and M. Pindor. “General Algorithm of Computation of $c$-Table and Detection of Valleys”. Ukrains’kyi Matematychnyi Zhurnal 62, no. 6 (June 25, 2010): 762–772. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/2907.