@article {957,
	title = {Caupolicana in Central America (Hymenoptera, Colletidae, Diphaglossinae)},
	journal = {ZooKeys},
	volume = {5},
	year = {2009},
	chapter = {53-64},
	author = {Michener, C. D. and Engel, M.S.}
}
@article {769,
	title = {A NEW SPECIES OF CHLEROGAS FROM THE ANDES OF CENTRAL COLOMBIA (HYMENOPTERA: HALICTIDAE)},
	journal = {Caldasia},
	volume = {31},
	year = {2009},
	chapter = {441-447},
	url = {www.unal.edu.co/icn/publicaciones/caldasia.htm},
	author = {Engel, M.S. and Gonzalez, V.H.}
}
@article {772,
	title = {NOTES ON THE AUGOCHLORINE BEE GENUS CHLEROGAS (HYMENOPTERA: HALICTIDAE)},
	journal = {Caldasia},
	volume = {31},
	year = {2009},
	chapter = {449-457},
	issn = {0366-5232},
	author = {Engel, M.S.}
}
@article {1065,
	title = {Revision of the bee genus Chlerogella (Hymenoptera, Halictidae), Part I: Central American species},
	journal = {ZooKeys},
	volume = {23},
	year = {2009},
	chapter = {47-75},
	author = {Engel, M.S.}
}
