Wituła, R., Hetmaniok, E. and Słota, D. (2012) “Ma’s identity and its applications”, Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, 11, pp. 43–52. Available at: https://studmath.uken.krakow.pl/article/view/13209 (Accessed: 31 October 2026).