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@article{DCG_1991__6_4_131161, author = {K. Mulmuley}, title = {On {Levels} in {Arrangements} and {Voronoi} {Diagrams.}}, journal = {Discrete & computational geometry}, pages = {307--338}, publisher = {mathdoc}, volume = {6}, number = {4}, year = {1991}, zbl = {0727.68129}, url = {http://geodesic.mathdoc.fr/item/DCG_1991__6_4_131161/} }
K. Mulmuley. On Levels in Arrangements and Voronoi Diagrams.. Discrete & computational geometry, Tome 6 (1991) no. 4, pp. 307-338. http://geodesic.mathdoc.fr/item/DCG_1991__6_4_131161/