An Extension of Manifold Boundary Representations to the r-Sets.

Hélène Desaulniers Neil F. Stewart An Extension of Manifold Boundary Representations to the r-Sets. 40-60 1992 11 ACM Trans. Graph. 1 http://doi.acm.org/10.1145/102377.111777 db/journals/tog/tog11.html#DesaulniersS92