Jacquelien M. A. Scherpen, Kenji Fujimoto, W. Steven Gray. Hamiltonian extensions, Hilbert adjoints and singular value functions for nonlinear systems. In 39th IEEE Conference on Decision and Control, CDC 2000, Sydney, Australia, December 12-15, 2000. pages 5102-5107, IEEE, 2000. [doi]
Abstract is missing.