1. J.M. Alonso, T. Brady, D. Cooper, V. Ferlini, M. Lustig, M. Mihalik, M. Shapiro, H. Short, Notes on word hyperbolic groups. Edited by Short, in Group Theory from a Geometrical Viewpoint (Trieste, 1990) (World Scientific, River Edge, NJ, 1991), pp. 3–63
2. N. Aronszajn, Differentiability of Lipschitzian mappings between Banach spaces. Stud. Math. 57 (2), 147–190 (1976)
3. K. Ball, The Ribe programme, in Séminaire Bourbaki, vol. 2011/2012. Exposés 1043–1058. Astérisque, vol. 352 (2013). Exp. No. 1047, viii, 147–159
4. F. Baudier, Metrical characterization of super-reflexivity and linear type of Banach spaces. Archiv. Math. 89 (5), 419–429 (2007)
5. F. Baudier, Embeddings of proper metric spaces into Banach spaces. Houst. J. Math. 38 (1), 209–223 (2012)