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    title = "Variational Collision Integrators and Optimal Control",
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    title = "Representations of Dirac Structures and Implicit Port-Controlled Lagrangian Systems",
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    title = "Bifurcations in Hamiltonian Systems with Symmetry",
    year = "1993",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20100830-100235392",
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    title = "Controllability and stabilizability of distributed bilinear systems: Recent results and open problems",
    year = "1980",
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