@misc
{TN_libero_mab2,
author = {
Wichtrich, Paul
},
title = {
Singschwäne, Cygnus cygnus (L.), bei Frohburg
},
publisher = {},
isbn = {0942-7872},
keywords = {
Frohburg
},
year = {1928},
address = {
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}