@article{10_2140_agt_2009_9_903,
     author = {Amendola, Gennaro},
     title = {A local calculus for nullhomotopic filling {Dehn} spheres},
     journal = {Algebraic and Geometric Topology},
     pages = {903--933},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2009},
     doi = {10.2140/agt.2009.9.903},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2009.9.903/}
}