@book { DasGewohnheitsrechtinderPraxisdesBundesgerichts,
    title = "Das Gewohnheitsrecht in der Praxis des Bundesgerichts",
    author = "Michel {Béguelin}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069124"
}