@article{https://authors.library.caltech.edu/records/6kn9p-a5y93,
    author = "Morgan, Daniel and Chung, Soon-Jo and Blackmore, Lars and Acikmese, Behcet and Bayard, David and Hadaegh, Fred Y.",
    title = "Swarm-Keeping Strategies for Spacecraft Under J\_2 and Atmospheric Drag Perturbations",
    year = "2012",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20170123-081714017",
    id = "https://authors.library.caltech.edu/records/6kn9p-a5y93",
    issn = "0731-5090",
    doi = "10.2514/1.55705",
    volume = "35",
    number = "5",
    pages = "1492-1506"
}


@book{https://authors.library.caltech.edu/records/fg4mg-3px53,
    author = "Morgan, Daniel and Chung, Soon-Jo and Blackmore, Lars and Acikmese, Behcet and Bayard, David S. and Hadaegh, Fred Y.",
    title = "Swarm Keeping Strategies for Spacecraft under J\_2 and Atmospheric Drag Perturbations",
    year = "2011",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20161222-113047812",
    id = "https://authors.library.caltech.edu/records/fg4mg-3px53",
    isbn = "978-1-60086-952-5",
    doi = "10.2514/6.2011-6632",
    pages = "Art. No. 2011-6632"
}