KUIPER, N. H. Stable surfaces in Euclidean three space. MATHEMATICA SCANDINAVICA, [S. l.], v. 36, p. 83–96, 1975. DOI: 10.7146/math.scand.a-11564. Disponível em: https://www.mscand.dk/article/view/11564. Acesso em: 6 may. 2024.