@article{10_2140_agt_2002_2_1179,
     author = {Margalit, Dan},
     title = {A lantern lemma},
     journal = {Algebraic and Geometric Topology},
     pages = {1179--1195},
     year = {2002},
     volume = {2},
     number = {2},
     doi = {10.2140/agt.2002.2.1179},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.1179/}
}