@article{10_2140_agt_2006_6_1113,
     author = {Habiro, Kazuo},
     title = {Bottom tangles and universal invariants},
     journal = {Algebraic and Geometric Topology},
     pages = {1113--1214},
     year = {2006},
     volume = {6},
     number = {3},
     doi = {10.2140/agt.2006.6.1113},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.1113/}
}