Automorphisms of semigroups of polynomials
Compositio Mathematica, Tome 21 (1969) no. 3, pp. 233-239. 
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     author = {Fadell, A. G. and Magill, Jr., K. D.},
     title = {Automorphisms of semigroups of polynomials},
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     publisher = {Wolters-Noordhoff Publishing},
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     number = {3},
     year = {1969},
     mrnumber = {248253},
     zbl = {0183.30701},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1969__21_3_233_0/}
}
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Fadell, A. G.; Magill, Jr., K. D. Automorphisms of semigroups of polynomials. Compositio Mathematica, Tome 21 (1969) no. 3, pp. 233-239. http://archive.numdam.org/item/CM_1969__21_3_233_0/

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M.L. Vitanza [3] Mappings of semigroups associated with ordered pairs, Amer. Math. Monthly 73 (1966) 1078-1082. | Zbl