@other{https://resolver.caltech.edu/CaltechTHESIS:05182018-144248304,
    title = "Unobserved Heterogeneity in Observational Studies of Political Behavior",
    url = "https://resolver.caltech.edu/CaltechTHESIS:05182018-144248304",
    id = "record",
    doi = "10.7907/XKQP-8429"
}