@book { EnvironmentalConstitutionalism,
    title = "Environmental Constitutionalism",
    subtitle = "What Impact on Legal Systems - Preface by Stéphane Pierré-Caps",
    author = "Jochen {Sohnle}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b16435",
    url = "https://www.peterlang.com/document/1113646"
}