@book { HenriHoppenot,
    title = "Henri Hoppenot",
    subtitle = "Diplomate (25 octobre 1891-10 août 1977)",
    author = "Colette {Barbier}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    url = "https://www.peterlang.com/document/1102666"
}