The definition of equivalence of combinatorial imbeddings
Publications Mathématiques de l'IHÉS, Tome 3 (1959), pp. 5-17. 
@article{PMIHES_1959__3__5_0,
     author = {Mazur, Barry},
     title = {The definition of equivalence of combinatorial imbeddings},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--17},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {3},
     year = {1959},
     mrnumber = {116346},
     zbl = {0119.38702},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1959__3__5_0/}
}
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Mazur, Barry. The definition of equivalence of combinatorial imbeddings. Publications Mathématiques de l'IHÉS, Tome 3 (1959), pp. 5-17. http://www.numdam.org/item/PMIHES_1959__3__5_0/