@book { DiekonomieinternationalenUmweltschutzes,
    title = "Die Ökonomie internationalen Umweltschutzes",
    author = "Oliver {Letzgus}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13946",
    url = "https://www.peterlang.com/document/1068496"
}