SAH, Chih-han. Scissors congruences, I. The Gauss-Bonnet map. Mathematica Scandinavica, Berkeley, CA, United States, v. 49, p. 181–210, 1981. DOI: 10.7146/math.scand.a-11930. Disponível em: https://journals.msp.org/mscand/article/view/1740. Acesso em: 25 jul. 2026.