@article {1414,
	title = {Studien {\"u}ber Choleva-Arten. I. {\"u}bersicht der Choleva-Arten Finlands},
	journal = {NOen},
	volume = {6},
	year = {1926},
	pages = {1-9.},
	author = {Krogerus, R.}
}
@article {1402,
	title = {Studien {\"u}ber Choleva Arten II. Lebensweise und Entwicklung von Choleva aquilonia Krog},
	journal = {NOen},
	volume = {7},
	number = {1},
	year = {1927},
	pages = {1-7.},
	author = {Krogerus, R.}
}
@article {1342,
	title = {Studien {\"u}ber Catops-Arten I. Die Catops-Arten Fennoskandiens und D{\"a}nemarks},
	journal = {NOen},
	volume = {11},
	year = {1931},
	pages = {1-25.},
	author = {Krogerus, R.}
}
