@article{10_2140_agt_2003_3_587,
     author = {Kuperberg, Greg},
     title = {What is a virtual link?},
     journal = {Algebraic and Geometric Topology},
     pages = {587--591},
     year = {2003},
     volume = {3},
     number = {1},
     doi = {10.2140/agt.2003.3.587},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2003.3.587/}
}