@book
{TN_libero_mab2,
author = {
},
title = {
Schwerpunkt - focusing on Der Ring des Nibelungen
= Focusing on Der Ring des Nibelungen
},
publisher = {Königshausen & Neumann},
year = {20XX-},
abstract = {Text teilw. dt., teilw. engl},
booktitle = {Wagnerspectrum ; .},
address = {
Würzburg
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}