1. On the Hausdorff volume in sub-Riemannian geometry;['Agrachev, Andrei', 'Barilari, Davide', 'Boscain, Ugo'];Calc. Var. Partial Differ. Equ.,2012
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3. Sub-Riemannian curvature in contact geometry;['Agrachev, Andrei', 'Barilari, Davide', 'Rizzi, Luca'];J. Geom. Anal.,2017
4. Curvature: a variational approach;['Agrachev, Andrei', 'Barilari, Davide', 'Rizzi, Luca'];Mem. Am. Math. Soc.,2018
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