Zelinskii, Y.B. and Stefanchuk, M.V. (2016) “Generalizations of the shadow problem”,
Ukrains’kyi Matematychnyi Zhurnal
, 68(6), pp. 757–763. Available at:
https://umj.imath.kiev.ua/index.php/umj/article/view/1876
(Accessed: 14 April 2025).