@article{DCG_1990__5_2_131137,
     author = {M.B. Dillencourt},
     title = {Toughness and {Delaunay} {Triangulations.}},
     journal = {Discrete & computational geometry},
     pages = {575--602},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1990},
     zbl = {0727.05040},
     url = {http://geodesic.mathdoc.fr/item/DCG_1990__5_2_131137/}
}