@other{https://resolver.caltech.edu/CaltechTHESIS:09272010-083324433,
    title = "The excitation operator method and the valence excited states of ethylene",
    url = "https://resolver.caltech.edu/CaltechTHESIS:09272010-083324433",
    id = "record",
    doi = "10.7907/RJ3Z-DE73"
}