@book { Infrastrukturinvestitionen,
    title = "Infrastrukturinvestitionen",
    author = "Manfred {Heid}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00366-6",
    url = "https://www.peterlang.com/document/1054156"
}