@book { Lagrammairegraduelleunevirguleprs,
    title = "La grammaire graduelle, à une virgule près",
    author = "Liana {Pop}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1098851"
}