Karpińska, Karolina, and Bogumiła Klemp-Dyczek. “The Otto Reichel’s Geometry of Circles As an Example of Work With a Gifted Student in Mathematics Lessons in the Second Half of the 19th Century”. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia 12 (December 24, 2020): 173–196. Accessed May 3, 2024. https://didacticammath.uken.krakow.pl/article/view/8354.