MAGNANI, V.; SCIENZA, M. Characterizations of differentiability for h-convex functions in stratified groups. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 13, n. 3, p. 675-697, 2014. DOI: 10.2422/2036-2145.201111_004. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/351. Acesso em: 20 feb. 2026.