@other{https://resolver.caltech.edu/CaltechAUTHORS:20151207-164957856,
    title = "Some Exploratory Photoelastic Studies in Stress Wave Propagation",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20151207-164957856",
    id = "record",
    doi = "10.7907/12v0-1266"
}


@other{https://resolver.caltech.edu/CaltechAUTHORS:20141014-144721865,
    title = "Additional Exploratory Photoelastic Studies in Stress Wave Propagation",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20141014-144721865",
    id = "record"
}