@article{https://resolver.caltech.edu/CaltechAUTHORS:CHApr30,
    title = "Scattering of hard γ-rays",
    journal = "Physical Review",
    year = "1930",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:CHApr30",
    id = "record",
    issn = "0031-899X",
    doi = "10.1103/PhysRev.36.1519",
    volume = "36"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:CHApnas30,
    title = "The absorption coefficient of hard gamma-rays",
    journal = "Proceedings of the National Academy of Sciences of the United States of America",
    year = "1930",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:CHApnas30",
    id = "record",
    issn = "0027-8424",
    doi = "10.1073/pnas.16.6.377",
    volume = "16"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:CHApnas29,
    title = "The problem of the ionized hydrogen molecule",
    journal = "Proceedings of the National Academy of Sciences of the United States of America",
    year = "1929",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:CHApnas29",
    id = "record",
    issn = "0027-8424",
    volume = "15"
}