CITTI, G.; GIOVANNARDI, G.; SIRE, Y. Schauder estimates up to the boundary on H-type groups: an approach via the double layer potential. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 27, n. 2, p. 895-941, 2026. DOI: 10.2422/2036-2145.202302_015. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/6420. Acesso em: 24 aug. 2026.