AQUINO, Cícero P.; BALTAZAR, Halyson I.; DE LIMA, Henrique F. New characterizations of spacelike hyperplanes in the steady state space. Mathematica Scandinavica, Berkeley, CA, United States, v. 126, n. 1, p. 61–72, 2020. DOI: 10.7146/math.scand.a-117703. Disponível em: https://journals.msp.org/mscand/article/view/203. Acesso em: 24 jul. 2026.