On the structure of certain semi-groups of spherical knot classes
Publications Mathématiques de l'IHÉS, Tome 3 (1959), pp. 19-27.
@article{PMIHES_1959__3__19_0,
     author = {Mazur, Barry},
     title = {On the structure of certain semi-groups of spherical knot classes},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {19--27},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {3},
     year = {1959},
     mrnumber = {116347},
     zbl = {0119.38703},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1959__3__19_0/}
}
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Mazur, Barry. On the structure of certain semi-groups of spherical knot classes. Publications Mathématiques de l'IHÉS, Tome 3 (1959), pp. 19-27. http://www.numdam.org/item/PMIHES_1959__3__19_0/

[1] B. Mazur, On Imbeddings of Spheres, Acta Mathematica (to appear). | Zbl

[2] V. K. A. M. Guggenheim, Piece wise Linear Isotopy, Journal of the London Math. Soc., vol. 46.