SERTÖZ, Sinan. $C^*$-actions on Grassmann bundles and the cycle at infinity. MATHEMATICA SCANDINAVICA, [S. l.], v. 62, p. 5–18, 1988. DOI: 10.7146/math.scand.a-12207. Disponível em: https://tidsskrift.dk/math/article/view/12207. Acesso em: 14 aug. 2026.