@article {22072,
	title = {{\"U}ber die Mundteile der Mycetophiliden, Sciariden und Cecidomyiiden},
	journal = {Acta Societatis pro Fauna et Flora Fennica},
	volume = {37},
	number = {2},
	year = {1913},
	pages = {3-54, taf. I-IV},
	url = {http://www.online-keys.net/sciaroidea/1911_20/Frey_1913_Mundteile_Mycetophiliden.pdf},
	author = {Frey, Richard}
}
@article {22073,
	title = {Die Dipterenfauna der Kanarischen Inseln und ihre Probleme},
	journal = {Commentationes Biologicae, Societas Scientiarum Fennica},
	volume = {4},
	year = {1931},
	pages = {1-237, 10 pl.},
	author = {Frey, Richard}
}
