@article{IM_1978__47_142569,
     author = {C. McA. Gordon and R.A. Litherland},
     title = {On the {Signature} of a {Link.}},
     journal = {Inventiones mathematicae},
     pages = {53--70},
     publisher = {mathdoc},
     volume = {47},
     year = {1978},
     zbl = {0391.57004},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__47_142569/}
}