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@article{MMO_1988_51_a4, author = {V. V. Fedorchuk}, title = {Multivalued retractions and characterizations of $n$-soft mappings}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {169--207}, publisher = {mathdoc}, volume = {51}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1988_51_a4/} }
V. V. Fedorchuk. Multivalued retractions and characterizations of $n$-soft mappings. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 51 (1988), pp. 169-207. http://geodesic.mathdoc.fr/item/MMO_1988_51_a4/