2 citations to https://www.mathnet.ru/eng/jdcs3

1. Annamaria Montanari, Daniele Morbidelli, “On the lack of semiconcavity of the subRiemannian distance in a class of Carnot groups”, Journal of Mathematical Analysis and Applications, 444:2 (2016), 1652  
2. A. A. Agrachev, “Topics in sub-Riemannian geometry”, Russian Math. Surveys, 71:6 (2016), 989–1019