@article{IM_1976__38_142451,
     author = {Pedersen and E.K.},
     title = {Topological {Concordances}},
     journal = {Inventiones mathematicae},
     pages = {255--268},
     year = {1976},
     volume = {38},
     url = {http://geodesic.mathdoc.fr/item/IM_1976__38_142451/}
}