@book { ManagementstruktureninderSPE,
    title = "Managementstrukturen in der SPE",
    author = "Jan Henning {Martens}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04088-3",
    url = "https://www.peterlang.com/document/1046483"
}