@other{https://resolver.caltech.edu/CaltechETD:etd-04222005-133013,
    title = "Elliptical galaxies : structure, stellar content, and evolution",
    url = "https://resolver.caltech.edu/CaltechETD:etd-04222005-133013",
    id = "record",
    doi = "10.7907/PQ71-9E96"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-09172008-093354,
    title = "Echelle Spectroscopy of the Central Stars of Planetary Nebulae",
    url = "https://resolver.caltech.edu/CaltechETD:etd-09172008-093354",
    id = "record",
    doi = "10.7907/jzsq-vr40"
}