DERRY, D. On Polygons in Real Projective $n$-Space. MATHEMATICA SCANDINAVICA, [S. l.], v. 6, p. 50–66, 1958. DOI: 10.7146/math.scand.a-10536. Disponível em: https://www.mscand.dk/article/view/10536. Acesso em: 11 apr. 2025.