@book { NachhaltigkeitundglobalerWandel,
    title = "Nachhaltigkeit und globaler Wandel",
    author = "Gotthilf {Hempel} and Meinhard {Schulz-Baldes}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094410"
}