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@article{CM_1973__26_3_283_0, author = {Ellentuck, Erik}, title = {On the form of functions which preserve regressive isols}, journal = {Compositio Mathematica}, pages = {283--302}, publisher = {Noordhoff International Publishing}, volume = {26}, number = {3}, year = {1973}, mrnumber = {344102}, zbl = {0272.02067}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1973__26_3_283_0/} }
Ellentuck, Erik. On the form of functions which preserve regressive isols. Compositio Mathematica, Tome 26 (1973) no. 3, pp. 283-302. http://geodesic.mathdoc.fr/item/CM_1973__26_3_283_0/