Vynnyts’kyiB. V., and ShapovalovskiiA. V. “A Remark on the Completeness of Systems of Exponentials With Weight in $L^2(ℝ)$”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 7 (July 25, 2000): 875-880. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4486.