@article {1766,
	title = {Contribution to the taxonomy of the Hylaeus gibbus species group in Europe (Hymenoptera, Apoidea and Colletidae)},
	journal = {Zootaxa},
	volume = {2932},
	year = {2011},
	pages = {51{\textendash}67},
	author = {Straka, J. and Bogusch, P.}
}
