Gubreev G. M. and Ignatenko T. R. (1992) “On the class of orthogonalizators of the families of exponents with real frequencies”, Ukrains’kyi Matematychnyi Zhurnal, 44(8), pp. 1031-1044. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8031 (Accessed: 27July2024).