@article{GDZPPN002534592,
title = {The number of antichains of finite power sets.},
journal = {Publications de l'Institut Math\'ematique [Elektronische Ressource]},
volume = {28},
year = {1972},
pages = {5-10},
zbl = {0266.05004},
url = {http://dml.mathdoc.fr/item/GDZPPN002534592}
}
Cvetkovic, D.M. The number of antichains of finite power sets.. Publications de l'Institut Mathématique [Elektronische Ressource], Tome 28 (1972) pp. 5-10. http://gdmltest.u-ga.fr/item/GDZPPN002534592/