@article{CMH_1976__51_139674,
     author = {C.M. Gordon},
     title = {Knots in the 4-sphere},
     journal = {Commentarii mathematici Helvetici},
     pages = {585--596},
     publisher = {mathdoc},
     volume = {51},
     year = {1976},
     zbl = {0346.55004},
     url = {http://geodesic.mathdoc.fr/item/CMH_1976__51_139674/}
}