Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{RCM_1972__6_181594, author = {M. A. Guti\'errez}, title = {Secondary invariants for links}, journal = {Revista colombiana de matematicas}, pages = {106--115}, publisher = {mathdoc}, volume = {6}, year = {1972}, zbl = {0254.57011}, url = {http://geodesic.mathdoc.fr/item/RCM_1972__6_181594/} }
M. A. Gutiérrez. Secondary invariants for links. Revista colombiana de matematicas, Tome 6 (1972), pp. 106-115. http://geodesic.mathdoc.fr/item/RCM_1972__6_181594/