@book { Virtus,
    title = "Virtus",
    subtitle = "Idéologie politique et croyances religieuses au IVe siècle",
    author = "François {Heim}",
    year = "1991",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1078857"
}