KAZARIAN, M. È. The Chern-Euler number of circle bundle via singularity theory. Mathematica Scandinavica, Berkeley, CA, United States, v. 82, n. 2, p. 207–236, 1998. DOI: 10.7146/math.scand.a-13834. Disponível em: https://journals.msp.org/mscand/article/view/994. Acesso em: 25 jul. 2026.