ERDOGAN, Mehmet; YILMAZ, Gülsen. A characterization of convex hypersurfaces in Hadamard manifolds. Mathematica Scandinavica, Berkeley, CA, United States, v. 97, n. 1, p. 40–48, 2005. DOI: 10.7146/math.scand.a-14962. Disponível em: https://journals.msp.org/mscand/article/view/735. Acesso em: 25 jul. 2026.