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@article{GMJ_2002__9_1_50810, author = {Bricchi, Michele}, title = {Existence and properties of -sets.}, journal = {Georgian Mathematical Journal}, pages = {13--32}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {2002}, zbl = {1040.28008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_2002__9_1_50810/} }
Bricchi, Michele. Existence and properties of -sets.. Georgian Mathematical Journal, Tome 9 (2002) no. 1, pp. 13-32. http://geodesic.mathdoc.fr/item/GMJ_2002__9_1_50810/