@book {1448,
	title = {Enumeratio Insectorum Fenniae II Hymenoptera 2. Terebrantia.},
	series = {Helsinki.},
	year = {1940},
	pages = {32 s},
	author = {H{\'e}llen, W.}
}
@book {764,
	title = {Enumeratio Insectorum Fenniae. II. Hymenoptera. 1. Symphyta et Aculeata.},
	year = {1935},
	pages = {15},
	address = {Helsinki},
	author = {Forsius, R. and H{\'e}llen, W.}
}
