@other{https://resolver.caltech.edu/CaltechETD:etd-08252008-153611,
    title = "Compact Infrared Sources: NGC 7538 and the Galactic Center",
    year = "1976",
    url = "https://resolver.caltech.edu/CaltechETD:etd-08252008-153611",
    id = "record",
    doi = "10.7907/YGRP-NJ17"
}