Vyhovs’kaI. Y., ZelinskiiY. B. and StefanchukM. V. (2015) “Generalized convex sets and the problem of shadow”, Ukrains’kyi Matematychnyi Zhurnal, 67(12), pp. 1658-1666. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2098 (Accessed: 23November2024).