@other{https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/n8f2y-0zw68,
    authors = "Gould, R. W. and Yariv, A. and Harp, R. S.",
    title = "Final Review Report to U.S. Office of Naval Research from California Institute of Technology",
    publisher = "California Institute of Technology",
    year = "2019",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20190403-122912149",
    id = "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/n8f2y-0zw68",
    doi = "10.7907/AHH4-0607"
}


@article{https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/rf3k4-kbe68,
    authors = "Smith, R. R. and Harp, R. S.",
    title = "New Experiments with Three-Pulse Echoes",
    journal = "Journal of Applied Physics",
    publisher = "American Institute of Physics",
    year = "1971",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20230613-155503247",
    id = "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/rf3k4-kbe68",
    issn = "1089-7550",
    doi = "10.1063/1.1659760",
    volume = "42",
    number = "11",
    pages = "4246-4251"
}