@article{CMH_1981__56_139863,
     author = {D.W. Sumners and L.R. Hitt},
     title = {Many different disk knots with the same exterior.},
     journal = {Commentarii mathematici Helvetici},
     pages = {142--147},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0465.57006},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139863/}
}