%0 Journal Article %A Jeff Cheeger %A Bruce Kleiner %T Generalized differentiation and bi-Lipschitz nonembedding in $ {L}^{1}$ %J Comptes Rendus. Mathématique %D 2006 %P 297-301 %V 343 %N 5 %I Elsevier %R 10.1016/j.crma.2006.07.001 %G en %F CRMATH_2006__343_5_297_0