@article{10_26493_1855_3974_98_ecc,
     author = {Valery A. Liskovets and Alexander D. Mednykh},
     title = {
		{On} the number of connected and disconnected coverings over a manifold
	},
     journal = {Ars Mathematica Contemporanea},
     pages = {181--189},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {2009},
     doi = {10.26493/1855-3974.98.ecc},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.26493/1855-3974.98.ecc/}
}