@book { DerStromgrohandelinDeutschland,
    title = "Der Stromgroßhandel in Deutschland",
    author = "Markus {Wiesner}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00254-6",
    url = "https://www.peterlang.com/document/1054301"
}