@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20181211-094921828,
    title = "VLBI and Compact Radio Sources",
    chapter = "Observations of Superluminal Motions in 3C 120",
    year = "1984",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20181211-094921828",
    id = "record",
    isbn = "9789027717399",
    doi = "10.1017/S0074180900077834"
}


@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20181121-090807122,
    title = "Extragalactic Radio Sources",
    chapter = "Superluminal Expansion of 3C 273",
    year = "1982",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20181121-090807122",
    id = "record",
    isbn = "9789027713841",
    doi = "10.1017/S0074180900028126"
}