@article{AA_2004_16_6_a4, author = {A. Lytchak}, title = {Differentiation in metric spaces}, journal = {Algebra i analiz}, pages = {128--161}, publisher = {mathdoc}, volume = {16}, number = {6}, year = {2004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AA_2004_16_6_a4/} }