@book { Countertrade,
    title = "Countertrade",
    subtitle = "Eine theoretische und empirische Analyse aus der Sicht einer kleinen offenen Volkswirtschaft (Schweiz)",
    author = "Rolf {Bürgin}",
    year = "1987",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1073647"
}