@book { SystemdynamischeLernumgebungen,
    title = "Systemdynamische Lernumgebungen",
    author = "Stefanie {Hillen} and Gunnar {Paul} and Frank {Puschhof}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094368"
}