BanduraA. І., and O. B. Skaskiv. 2017. “Directional Logarithmic Derivative and the Distribution of Zeros of an Entire Function of Bounded $L$-Index in the Direction”. Ukrains’kyi Matematychnyi Zhurnal 69 (3), 426-32. https://umj.imath.kiev.ua/index.php/umj/article/view/1706.