@book { DieBercksichtigungvonKosteninderKonkurrenzanalyse,
    title = "Die Berücksichtigung von Kosten in der Konkurrenzanalyse",
    author = "Christoph {Heinen}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13850",
    url = "https://www.peterlang.com/document/1068412"
}