Geodesic
Almost convex sets
Matematičeskie zametki, Tome 18 (1975) no. 3, pp. 343-356 
L. P. Vlasov. Almost convex sets. Matematičeskie zametki, Tome 18 (1975) no. 3, pp. 343-356. http://geodesic.mathdoc.fr/item/MZM_1975_18_3_a3/
@article{MZM_1975_18_3_a3,
     author = {L. P. Vlasov},
     title = {Almost convex sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {343--356},
     year = {1975},
     volume = {18},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_3_a3/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The concept of a wedgoid, a generalized wedge, is introduced and studied. Almost all convex sets are characterized by the fact that balls can be separated from such a set by means of wedgoids.