@Article{ RizSil15, author = { Rizzi, Luca and Silveira, Pavel }, title = { Sub-Riemannian Ricci curvatures and universal diameter bounds for 3-Sasakian manifolds }, journal = { Journal of the Institute of Mathematics of Jussieu }, year = { 2015 }, doi = { 10.1017/S1474748017000226 }, pages = { 34 }, URL = { http://cvgmt.sns.it/paper/2803/ }, note = { cvgmt preprint} }