@other{https://resolver.caltech.edu/CaltechETD:etd-05042007-134103,
    title = "A unified framework for constraint-based modeling",
    year = "1990",
    url = "https://resolver.caltech.edu/CaltechETD:etd-05042007-134103",
    id = "record",
    doi = "10.7907/33km-wt29"
}