BRUCE, J. W. Projections and reflections of generic surfaces in $\mathsf{R}^3$. Mathematica Scandinavica, Berkeley, CA, United States, v. 54, p. 262–278, 1984. DOI: 10.7146/math.scand.a-12058. Disponível em: https://journals.msp.org/mscand/article/view/1569. Acesso em: 25 jul. 2026.