Kondratyuk, Y.V., Kondratyuk, A.A. and Tarasyuk, S.I. (1996) “General páley problem”, Ukrains’kyi Matematychnyi Zhurnal, 48(1), pp. 25–34. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5359 (Accessed: 7 April 2025).