All two dimensions links are null homotopic.
Bartels, Arthur ; Teichner, Peter
Geometry & Topology, Tome 3 (1999), p. 235-252 / Harvested from The Electronic Library of Mathematics
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Publié le : 1999-01-01
DOI : https://doi.org/10.2140/gt.1999.3.235
EUDML-ID : urn:eudml:doc:120045 
@article{01336583,
     title = {All two dimensions links are null homotopic.},
     journal = {Geometry \& Topology},
     volume = {3},
     year = {1999},
     pages = {235-252},
     doi = {10.2140/gt.1999.3.235},
     zbl = {0927.57023},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01336583}
}

Bartels, Arthur; Teichner, Peter. All two dimensions links are null homotopic.. Geometry & Topology, Tome 3 (1999) pp. 235-252. doi : 10.2140/gt.1999.3.235. http://gdmltest.u-ga.fr/item/01336583/