Existence, Multiplicity, and Regularity for sub-Riemannian Geodesics by Variational Methods. - Roberto Giambò; Fabio Giannoni; Paolo Piccione (SIAM J. Control. Optim., 2002)

Optimal Control on Riemannian Manifolds by Interpolation. - Roberto Giambò; Fabio Giannoni; Paolo Piccione (Math. Control. Signals Syst., 2004)

On the semi-Riemannian bumpy metric theorem. - L. Biliotti; M. A. Javaloyes; Paolo Piccione (J. Lond. Math. Soc., 2011)