BAKER, A.; RAY, N. Some infinte families of U-hypersurfaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 50, p. 149–166, 1982. DOI: 10.7146/math.scand.a-11952. Disponível em: https://www.mscand.dk/article/view/11952. Acesso em: 3 may. 2024.