@CONFERENCE\{IMM1981-03757,
    author       = "V. V. Vidal and H. Ravn",
    title        = "Optimal Control of Servomechanisms",
    year         = "1981",
    pages        = "231-260",
    booktitle    = "International Conference on Applied Modelling and Simulation, Lyon, France",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3757-full.html"
}