@book { SubstanzundFreiheitbeiThomasvonAquin,
    title = "Substanz und Freiheit bei Thomas von Aquin",
    author = "Michael {Becker}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01690-1",
    url = "https://www.peterlang.com/document/1044493"
}