1. Astolfi, A., Chhabra, D., & Ortega, R. (2001). Asymptotic stabilization of selected equilibria of the underactuated Kirchhoff's equations. Systems and Control Letters, to appear. See also: ACC 2001, Arlington, VA, USA, June 25–27.
2. Blankenstein, G., Ortega, R., & van der Schaft, A. J. (2001). The matching conditions of controlled Lagrangians and interconnection assignment passivity based control, LSS Int. Report, May. To appear in International Journal of Control.
3. Controlled Lagrangians and the stabilization of mechanical systems;Bloch;IEEE Transactions of Automatic Control,2000
4. On representations and integrability of mathematical structures in energy-conserving physical systems;Dalsmo;SIAM Journal on Optimization and Control,1999
5. Canonical transformations and stabilization of generalized Hamiltonian systems;Fujimoto;Systems and Control Letters,2001