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    title = "The effects of pressure on the buoyant behavior of deoxyribonucleic acid and tobacco mosaic virus in a density gradient at equilibrium in the ultracentrifuge",
    journal = "Proceedings of the National Academy of Sciences of the United States of America",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:HEApnas61a",
    id = "record",
    issn = "0027-8424",
    doi = "10.1073/pnas.47.7.1015",
    volume = "47"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:HEApnas61b,
    title = "A three-component theory of sedimentation equilibrium in a density gradient",
    journal = "Proceedings of the National Academy of Sciences of the United States of America",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:HEApnas61b",
    id = "record",
    issn = "0027-8424",
    doi = "10.1073/pnas.47.7.999",
    volume = "47"
}