@other{https://resolver.caltech.edu/CaltechAUTHORS:20180413-085139833,
    title = "Hubbert analysis for coal",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20180413-085139833",
    id = "record"
}


@other{https://resolver.caltech.edu/CaltechAUTHORS:RUTtownhall07,
    title = "World fossil-fuel supplies",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:RUTtownhall07",
    id = "record"
}