@book { Mdiationuniqueettransfigurationuniverselle,
    title = "Médiation unique et transfiguration universelle",
    author = " {Fritz Frei Sj}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071094"
}