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@article{SF_1996__52_3_135446, author = {Z. Goseki}, title = {Multiplicative closed maps on the set of {S-subsets} of an {S-set.}}, journal = {Semigroup forum}, pages = {181--190}, publisher = {mathdoc}, volume = {52}, number = {3}, year = {1996}, zbl = {0849.20048}, url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135446/} }
Z. Goseki. Multiplicative closed maps on the set of S-subsets of an S-set.. Semigroup forum, Tome 52 (1996) no. 3, pp. 181-190. http://geodesic.mathdoc.fr/item/SF_1996__52_3_135446/