@book { Lamodalitetsesralisationsenfranais,
    title = "La modalité et ses réalisations en français",
    author = "Udo {Mai}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15262",
    url = "https://www.peterlang.com/document/1056481"
}