@article{10_2140_agt_2007_7_1297,
     author = {Day, Matthew B},
     title = {Extending {Johnson{\textquoteright}s} and {Morita{\textquoteright}s} homomorphisms to the mapping class group},
     journal = {Algebraic and Geometric Topology},
     pages = {1297--1326},
     year = {2007},
     volume = {7},
     number = {3},
     doi = {10.2140/agt.2007.7.1297},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.1297/}
}