Elets, L. V. and Masharov, P. A. (2009) “On one extremal problem of Pompeiu sets”, Ukrains’kyi Matematychnyi Zhurnal, 61(1), pp. 61-72. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3001 (Accessed: 29March2024).