@article{10_1090_S0894_0347_08_00615_2,
     author = {Larsen, Michael and Shalev, Aner},
     title = {Word maps and {Waring} type problems},
     journal = {Journal of the American Mathematical Society},
     pages = {437--466},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {2009},
     doi = {10.1090/S0894-0347-08-00615-2},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-08-00615-2/}
}