@book { UnfallhaftungbeimExpeditionsundTrekkingbergsteigen,
    title = "Unfallhaftung beim Expeditions- und Trekkingbergsteigen",
    author = "Kirbinian {Dietl}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1089778"
}