Aquino, Cícero P., Halyson I. Baltazar, and Henrique F. de Lima. “New Characterizations of Spacelike Hyperplanes in the Steady State Space”. MATHEMATICA SCANDINAVICA 126, no. 1 (March 29, 2020): 61–72. Accessed November 24, 2024. https://www.mscand.dk/article/view/117703.