@article{10_2140_agt_2002_2_665,
     author = {Khovanov, Mikhail},
     title = {A functor-valued invariant of tangles},
     journal = {Algebraic and Geometric Topology},
     pages = {665--741},
     year = {2002},
     volume = {2},
     number = {2},
     doi = {10.2140/agt.2002.2.665},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.665/}
}