@article{10_2140_agt_2006_6_809,
     author = {Nendorf, Rob and Scoville, Nick and Strom, Jeffrey},
     title = {Categorical sequences},
     journal = {Algebraic and Geometric Topology},
     pages = {809--838},
     year = {2006},
     volume = {6},
     number = {2},
     doi = {10.2140/agt.2006.6.809},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.809/}
}