HANSEN, H. C. On Cycles in Flag Manifolds. MATHEMATICA SCANDINAVICA, [S. l.], v. 33, p. 269–274, 1973. DOI: 10.7146/math.scand.a-11489. Disponível em: https://www.mscand.dk/article/view/11489. Acesso em: 2 may. 2024.