@article {1039,
	title = {Revisio synoptica apum borealium, comparatis speciebus Europae mediae},
	journal = {Acta Soc. Fauna Flora Fennica},
	volume = {3},
	year = {1852},
	pages = {225-286},
	author = {Nylander, W.}
}
@article {1038,
	title = {Supplementum adnotationem in expositionem apum borealium},
	journal = {Acta Soc. Fauna Flora Fennica},
	volume = {3},
	year = {1852},
	pages = {93-107},
	author = {Nylander, W.}
}
