@article { DieRolleHeinrichsdesLwenaufdemWendenkreuzzug1147,
    title = "Die Rolle Heinrichs des Löwen auf dem Wendenkreuzzug 1147",
    author = "Christoffer {Theis}",
    year = "2022",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    journal = "Mediaevistik",
    number = "1",
    volume = "32",
    doi = "10.3726/med.2019.01.11",
    url = "https://www.peterlang.com/document/1272084"
}