@article{10_2140_agt_2006_6_1459,
     author = {Bar-Natan, Dror and Morrison, Scott},
     title = {The {Karoubi} envelope and {Lee{\textquoteright}s} degeneration of {Khovanov} homology},
     journal = {Algebraic and Geometric Topology},
     pages = {1459--1469},
     year = {2006},
     volume = {6},
     number = {3},
     doi = {10.2140/agt.2006.6.1459},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.1459/}
}