@article {987,
	title = {{\"U}ber die Psammocharidae (Pompilidae) Finnlands},
	journal = {Notulae Entomologicae},
	volume = {8},
	year = {1928},
	pages = {1-13},
	author = {Nordstr{\"o}m, {\r A}. and Forsius, R.}
}
@article {797,
	title = {Zur Biologie der s{\"u}dfinnischen Hummeln},
	journal = {Ann. Univ. Aboensis A},
	volume = {3},
	year = {1928},
	pages = {1-81},
	author = {Hulkkonen, O.}
}
