Holá, L. and Kwiecińska, G. (2020) “On the Borel classes of set-valued maps of two variables”, Annales Mathematicae Silesianae, 34(1), pp. 81–95. Available at: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/13634 (Accessed: 6 May 2025).