@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20230602-402650400.1,
    title = "Fortschritte der Chemie Organischer Naturstoffe",
    chapter = "The Carbon Cycle in Nature",
    year = "1957",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20230602-402650400.1",
    id = "record",
    isbn = "978-3-7091-7165-3",
    doi = "10.1007/978-3-7091-7164-6\_7"
}


@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20151021-094312456,
    chapter = "The possibilities of obtaining long-range supplies of uranium, thorium, and other substances from igneous rocks",
    year = "1956",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20151021-094312456",
    id = "record"
}