@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}, zbl = {0119.38703}, mrnumber = {116347}, language = {en}, url = {www.numdam.org/item/PMIHES_1959__3__19_0/} }
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/
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