@article{https://resolver.caltech.edu/CaltechAUTHORS:BADjcp57,
    title = "Spectra of Urea and Thiourea in the 3µ Region",
    journal = "Journal of Chemical Physics",
    year = "1957",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:BADjcp57",
    id = "record",
    issn = "0021-9606",
    doi = "10.1063/1.1743280",
    volume = "26"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:20140807-165557542,
    title = "The Planarity of the Urea Molecule",
    journal = "Journal of Chemical Physics",
    year = "1950",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20140807-165557542",
    id = "record",
    issn = "0021-9606",
    doi = "10.1063/1.1747692",
    volume = "18"
}