@other{https://resolver.caltech.edu/CaltechETD:etd-12182007-090504,
    title = "Sensor Based Motion Planning: The Hierarchical Generalized Voronoi Graph",
    year = "1996",
    url = "https://resolver.caltech.edu/CaltechETD:etd-12182007-090504",
    id = "record",
    doi = "10.7907/49ee-a204"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-08132007-134534,
    title = "A formal representational theory for engineering design",
    year = "1992",
    url = "https://resolver.caltech.edu/CaltechETD:etd-08132007-134534",
    id = "record",
    doi = "10.7907/tx29-f628"
}