@article{10_1090_S0894_0347_1989_1002633_4,
     author = {Almgren, Frederick J. and Lieb, Elliott H.},
     title = {Symmetric decreasing rearrangement is sometimes continuous},
     journal = {Journal of the American Mathematical Society},
     pages = {683--773},
     publisher = {mathdoc},
     volume = {02},
     number = {4},
     year = {1989},
     doi = {10.1090/S0894-0347-1989-1002633-4},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1989-1002633-4/}
}