GÁBOS, Zoltán; MESTER, Ágnes. Lines in the three-dimensional Bolyai-Lobachevskian hyperbolic geometry. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 60, n. 4, p. 583–595, 2015. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5835. Acesso em: 5 feb. 2025.