Makhmudova, M. G., and A. Kh. Khanmamedov. 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.