Vynnyts’kyiB. V., and SharanV. “On Zeros of One Class of Functions Analytic in a Half-Plane”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 55, no. 9, Sept. 2003, pp. 1254-9, https://umj.imath.kiev.ua/index.php/umj/article/view/3998.