@misc
{TN_libero_mab2,
author = {
Schumann, Clara
Backes, Dieter Michael
},
title = {
Etüde As-Dur
für Klavier, for piano
},
publisher = {Certosa},
publisher = {},
year = {[2010?]},
year = {, © 2010},
address = {
Klein-Winternheim
,
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}