no. 3
On the form of functions which preserve regressive isols
Compositio Mathematica, Tome 26 (1973) no. 3, pp. 283-302 
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     mrnumber = {344102},
     zbl = {0272.02067},
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     url = {https://www.numdam.org/item/CM_1973__26_3_283_0/}
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Ellentuck, Erik. On the form of functions which preserve regressive isols. Compositio Mathematica, Tome 26 (1973) no. 3, pp. 283-302. https://www.numdam.org/item/CM_1973__26_3_283_0/

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