@other{https://resolver.caltech.edu/CaltechETD:etd-12062006-104710,
    title = "Understanding Hierarchical Design",
    year = "1980",
    url = "https://resolver.caltech.edu/CaltechETD:etd-12062006-104710",
    id = "record",
    doi = "10.7907/Z9BP00R2"
}