@article{https://resolver.caltech.edu/CaltechAUTHORS:ANDpr59,
    title = "Sudden increase of cosmic-ray intensity",
    journal = "Physical Review",
    year = "1959",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:ANDpr59",
    id = "record",
    issn = "0031-899X",
    doi = "10.1103/PhysRev.116.461",
    volume = "116"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:NEHpr58,
    title = "Cosmic-ray changes from 1954 to 1957",
    journal = "Physical Review",
    year = "1958",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:NEHpr58",
    id = "record",
    issn = "0031-899X",
    doi = "10.1103/PhysRev.109.608",
    volume = "109"
}