@book { VaguenessinNormativeTexts,
    title = "Vagueness in Normative Texts",
    author = "Vijay K. {Bhatia} and Jan {Engberg} and Maurizio {Gotti} and Dorothee {Heller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1098887"
}