@article{article9cce7351,
title   = {Using sentinels to detect intersections of convex and nonconvex polygons},
author = {Mascarenhas, Walter Figueiredo and Birgin, Ernesto Julian Goldberg},
year = {2010},
doi = {10.1590/S1807-03022010000200008},
journal   = {Computational and Applied Mathematics}
}