@book { ZukunftsperspektivenderDonauschiffahrtnach1980,
    title = "Zukunftsperspektiven der Donauschiffahrt nach 1980",
    author = "Walter {Althammer}",
    year = "1973",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12595",
    url = "https://www.peterlang.com/document/1067044"
}