@article{MZ_1984__187_173488,
     author = {Bradd E. Clark and Victor P. Schneider},
     title = {All {Knot} {Groups} {Are} {Metric.}},
     journal = {Mathematische Zeitschrift},
     pages = {269--272},
     publisher = {mathdoc},
     volume = {187},
     year = {1984},
     zbl = {0536.57002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__187_173488/}
}