DJIRE, Ibrahim K.; WIEGERINCK, Jan. On a question of Sadullaev concerning boundary relative extremal functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 124, n. 1, p. 51–60, 2019. DOI: 10.7146/math.scand.a-105141. Disponível em: https://journals.msp.org/mscand/article/view/251. Acesso em: 24 jul. 2026.