@book { HybrideRegulierungdesFreiverkehrs,
    title = "Hybride Regulierung des Freiverkehrs",
    author = "Michael {Schweppe}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02351-0",
    url = "https://www.peterlang.com/document/1046159"
}