@Article{Nip09,
    Author       = "Nipkow, T.",
    Year         = "2009",
    Title        = "{Social Choice Theory in HOL: Arrow and
                    Gibbard-Satterthwaite}",
    Journal      = "Journal of Automated Reasoning",
    Volume       = "43",
    Number       = "3",
    Pages        = "289-304",
    Comment      = "TPTPRef"
}