MakhmudovaM. G., and KhanmamedovA. Kh. 2019. “On the Spectral Properties of the One-dimensional Stark Operator on the Half-Line”. Ukrains’kyi Matematychnyi Zhurnal 71 (11), 1579-84. https://umj.imath.kiev.ua/index.php/umj/article/view/1537.