@article{CRMATH_2006__343_5_297_0,
     author = {Cheeger, Jeff and Kleiner, Bruce},
     title = {Generalized differentiation and {bi-Lipschitz} nonembedding in $ {L}^{1}$},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {297--301},
     publisher = {Elsevier},
     volume = {343},
     number = {5},
     year = {2006},
     doi = {10.1016/j.crma.2006.07.001},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2006.07.001/}
}