"1840Z"^^ . "1840-12-24Z"^^ . "Wilken, Friedrich"@en . "1777-05-23Z"^^ . . "Friedrich Wilken (23 May 1777 in Ratzeburg \u2013 24 December 1840 in Berlin) was a German historian (orientalist), professor and librarian."@en . "German historian, professor and librarian" . . . . "1777Z"^^ .