@misc
{TN_libero_mab2,
author = {
Rothwell, Gar W.
},
title = {
Ontogeny of the Paleozoic Ovule, Callospermarion pusillum
},
publisher = {American Botanical Society},
isbn = {0002-9122},
isbn = {1537-2197},
year = {1971},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}