TUNG, Chia-chi; LAMBERTI, Pier Domenico. On Rellich‘s Lemma, the Poincaré inequality, and Friedrichs extension of an operator on complex spaces. CUBO, A Mathematical Journal, [S. l.], v. 23, n. 2, p. 265–285, 2021. DOI: 10.4067/S0719-06462021000200265. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/2716. Acesso em: 12 oct. 2025.