Zvereva, M. B., Pokornyi, Y. V. and Shabrov, S. A. (2008) “On extension of the Sturm-Liouville oscillation theory to problems with pulse parameters”, Ukrains’kyi Matematychnyi Zhurnal, 60(1), pp. 95–99. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3140 (Accessed: 25April2024).