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@article{DCG_1993__10_2_131261, author = {Beifang Chen}, title = {On the {Euler} {Characteristic} of {Finite} {Unions} of {Convex} {Sets.}}, journal = {Discrete & computational geometry}, pages = {79--94}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1993}, zbl = {0783.52001}, url = {http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131261/} }
Beifang Chen. On the Euler Characteristic of Finite Unions of Convex Sets.. Discrete & computational geometry, Tome 10 (1993) no. 2, pp. 79-94. http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131261/