@book { DieAffreHillmerEinOkulistausBerlininPetersburg1751,
    title = "Die Affäre Hillmer- Ein Okulist aus Berlin in Petersburg 1751",
    author = "Aloys {Henning}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1074723"
}