@inbook {30350, title = {Das quadrivium}, booktitle = {Geschichte der Universit{\"a}t in Europa}, year = {1993}, pages = {303{\textendash}320}, publisher = {Beck}, organization = {Beck}, address = {M{\"u}nchen}, isbn = {978-3-406-36956-1}, author = {North, John}, editor = {R{\"u}egg, Walter} }