@other{https://resolver.caltech.edu/CaltechTHESIS:01232018-095827563,
    title = "Experiments on the Nutrition of Isolated Roots",
    year = "1939",
    url = "https://resolver.caltech.edu/CaltechTHESIS:01232018-095827563",
    id = "record",
    doi = "10.7907/F2N6-4H73"
}