1.
Zvereva MB, Pokornyi YV, Shabrov SA. On extension of the Sturm-Liouville oscillation theory to problems with pulse parameters. Ukr. Mat. Zhurn. [Internet]. 2008Jan.25 [cited 2024Apr.26];60(1):95–99. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3140