KALYUZHNYI, A. A.; PODKOLZIN, G. B.; CHAPOVSKY, Yu. A. On infinitesimal structure of a hypergroup that originates from a Lie group. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 4, p. 319–329, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/496. Acesso em: 16 dec. 2025.