IBAÑEZ FIRNKORN, G. H.; RIVEROS, M. S. Certain fractional type operators with Hörmander conditions. Annales Fennici Mathematici, [S. l.], v. 43, n. 2, p. 913–929, 2018. DOI: 10.5186/aasfm.2018.4353. Disponível em: https://afm.journal.fi/article/view/135763. Acesso em: 20 touko. 2024.