@article{https://authors.library.caltech.edu/records/k8dd3-xck46,
    author = "Bills, Bruce G. and Ferrari, Alfred J.",
    title = "A lunar density model consistent with topographic, gravitational, librational, and seismic data",
    year = "1977",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20160520-154932140",
    id = "https://authors.library.caltech.edu/records/k8dd3-xck46",
    issn = "0148-0227",
    doi = "10.1029/JB082i008p01306",
    volume = "82",
    number = "8",
    pages = "1306-1314"
}


@article{https://authors.library.caltech.edu/records/2fwp9-hd755,
    author = "Ferrari, Alfred J.",
    title = "Lunar Gravity: The First Farside Map",
    year = "1975",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20151116-143721411",
    id = "https://authors.library.caltech.edu/records/2fwp9-hd755",
    issn = "0036-8075",
    doi = "10.1126/science.188.4195.1297",
    volume = "188",
    number = "4195",
    pages = "1297-1300"
}