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@article{MZ_1972__124_171652, author = {Mordechai Lewin}, title = {Choice {Mappings} of {Certain} {Classes} of {Finite} {Sets.}}, journal = {Mathematische Zeitschrift}, pages = {23--36}, publisher = {mathdoc}, volume = {124}, year = {1972}, zbl = {0221.05006}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171652/} }
Mordechai Lewin. Choice Mappings of Certain Classes of Finite Sets.. Mathematische Zeitschrift, Tome 124 (1972), pp. 23-36. http://geodesic.mathdoc.fr/item/MZ_1972__124_171652/