@article{MM2_1988__61_4_155315,
     author = {Pawel Traczyk},
     title = {Non-Trivial negative links have positive signature.},
     journal = {Manuscripta mathematica},
     pages = {279--284},
     publisher = {mathdoc},
     volume = {61},
     number = {4},
     year = {1988},
     zbl = {0665.57008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1988__61_4_155315/}
}