Błaszczyk, P. “Nota O Rozprawie Eduarda Heinego Elemente Der Functionenlehre”. Annales Universitatis Paedagogicae Cracoviensis | Studia Ad Didacticam Mathematicae Pertinentia, vol. 6, July 2017, pp. 139-52, https://didacticammath.uken.krakow.pl/article/view/3653.