@article{PMIHES_1959__3__19_0,
     author = {Barry Mazur},
     title = {On the structure of certain semi-groups of spherical knot classes},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {19--27},
     year = {1959},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {3},
     doi = {10.1007/BF02684388},
     mrnumber = {116347},
     zbl = {0119.38703},
     language = {en},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02684388/}
}