SAH, Chih-han. Scissors congruences, I. The Gauss-Bonnet map. MATHEMATICA SCANDINAVICA, [S. l.], v. 49, p. 181–210, 1981. DOI: 10.7146/math.scand.a-11930. Disponível em: https://tidsskrift.dk/math/article/view/11930. Acesso em: 14 aug. 2026.