author = { Beethoven, Ludwig van Beethoven, Ludwig van },

title = { Volkslied-Variationen für Klavier 3 Zehn variierte Themen : op. 107 (Nr. 6 - 10) },

publisher = {Hug},

year = {[ca. 1970]},

booktitle = {Der unbekannte Beethoven},

address = { Zürich },

url = { http://slubdd.de/katalog?TN_libero_mab2 }