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@article{SF_1996__52_3_135460, author = {G.B. Shi and G.P. Wang}, title = {Z-mappings and a classification theorem.}, journal = {Semigroup forum}, pages = {349--356}, publisher = {mathdoc}, volume = {52}, number = {3}, year = {1996}, zbl = {0847.06001}, url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135460/} }
G.B. Shi; G.P. Wang. Z-mappings and a classification theorem.. Semigroup forum, Tome 52 (1996) no. 3, pp. 349-356. http://geodesic.mathdoc.fr/item/SF_1996__52_3_135460/