Published in 1999 There are ... items referenced. 1999 -- Romeo Ortega, Arjan J. van der Schaft, Bernhard M. MaschkeStabilization of port-controlled Hamiltonian systems via energy balancing 1999 -- Gerardo Escobar, Arjan J. van der Schaft, Romeo OrtegaA Hamiltonian viewpoint in the modeling of switching power converters