@article{GDZPPN002410079, title = {Choice Mappings of Certain Classes of Finite Sets.}, journal = {Mathematische Zeitschrift}, volume = {129}, year = {1972}, pages = {23-36}, zbl = {0221.05006}, url = {http://dml.mathdoc.fr/item/GDZPPN002410079} }
Lewin, Mordechai. Choice Mappings of Certain Classes of Finite Sets.. Mathematische Zeitschrift, Tome 129 (1972) pp. 23-36. http://gdmltest.u-ga.fr/item/GDZPPN002410079/