@book { EntrepreneurshipinForschungundLehre,
    title = "Entrepreneurship in Forschung und Lehre",
    author = "Klaus {Walterscheid}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095157"
}