@misc
{TN_libero_mab2,
author = {
Schubert, Franz
},
title = {
Quatre impromptus
op. 90
},
publisher = {Litolff},
year = {[ca. 1880]},
booktitle = {Compositions pour piano à 2 mains / Fr. Schubert ; 8},
address = {
Braunschweig
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}