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@article{10_4064_cm_4_1_1_10, author = {J. Perkal}, title = {Sur les ensembles \ensuremath{\varepsilon}-convexes}, journal = {Colloquium Mathematicum}, pages = {1--10}, publisher = {mathdoc}, volume = {4}, number = {1}, year = {1956}, doi = {10.4064/cm-4-1-1-10}, language = {fr}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-4-1-1-10/} }
J. Perkal. Sur les ensembles ε-convexes. Colloquium Mathematicum, Tome 4 (1956) no. 1, pp. 1-10. doi : 10.4064/cm-4-1-1-10. http://geodesic.mathdoc.fr/articles/10.4064/cm-4-1-1-10/
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