MAČYS, Juozas. Variants of the functional equation of Cauchy. Lietuvos matematikos rinkinys, [S. l.], v. 44, n. spec., p. 486–490, 2004. DOI: 10.15388/LMR.2004.32021. Disponível em: https://www.journals.vu.lt/LMR/article/view/32021.. Acesso em: 20 may. 2024.