@article{CRMATH_2007__345_11_643_0,
     author = {Ollivier, Yann},
     title = {Ricci curvature of metric spaces},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {643--646},
     publisher = {Elsevier},
     volume = {345},
     number = {11},
     year = {2007},
     doi = {10.1016/j.crma.2007.10.041},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.crma.2007.10.041/}
}