Krech, Ireneusz. “Awaiting the Series of Colors - Stochastic Graph As a Means of Mathematical Treatment and Argumentation”. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica 3 (May 27, 2003): 119–124. Accessed October 30, 2026. https://studmath.uken.krakow.pl/article/view/13477.