Major, J., and M. Major. “Wokół Twierdzenia Picka”. Annales Universitatis Paedagogicae Cracoviensis | Studia Ad Didacticam Mathematicae Pertinentia, vol. 3, July 2017, pp. 117-40, https://didacticammath.uken.krakow.pl/article/view/3767.