DIEU, Nguyen Quang; LONG, Tang Van. Product property of global $P$-extremal functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 127, n. 3, 2021. DOI: 10.7146/math.scand.a-129007. Disponível em: https://journals.msp.org/mscand/article/view/132. Acesso em: 24 jul. 2026.