@book { GasnetzzuganginDeutschlandundinSpanien,
    title = "Gasnetzzugang in Deutschland und in Spanien",
    author = "Sebastian {Kemper}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02263-6",
    url = "https://www.peterlang.com/document/1047292"
}