@misc
{TN_libero_mab2,
author = {
Thomsen, Erik
},
title = {
Seasonal variation in boreal Early Cretaceous calcareous nannofossils
},
publisher = {Elsevier BV},
isbn = {0377-8398},
keywords = {
Paleontology
,
Oceanography
},
year = {1989},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}