@book { ColloquiumslavicumbasilienseGedenkschriftfrHildegardSchroeder,
    title = "Colloquium slavicum basiliense. Gedenkschrift für Hildegard Schroeder",
    author = "Heinrich {Riggenbach}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071021"
}