@book { StudienzurterminologischenLexikbulgarischerGeographielehrbcher18351875, title = "Studien zur terminologischen Lexik bulgarischer Geographielehrbücher (1835-1875)", author = "Sabine {Riedel}", year = "1992", publisher = "Biblion", address = ", Germany", doi = "10.3726/b12327", url = "https://www.peterlang.com/document/1082619" }