@article{GDZPPN000364592,
title = {Toughness and Delaunay Triangulations.},
journal = {Discrete \& computational geometry},
volume = {5},
year = {1990},
pages = {575-602},
zbl = {0727.05040},
url = {http://dml.mathdoc.fr/item/GDZPPN000364592}
}
Dillencourt, M.B. Toughness and Delaunay Triangulations.. Discrete & computational geometry, Tome 5 (1990) pp. 575-602. http://gdmltest.u-ga.fr/item/GDZPPN000364592/