1. A cytological study of the genus Poa;Armstrong;Canadian Journ. of Research,1937
2. Synopsis der Mitteleuropäischen Flora;Ascherson,1898
3. Karyosystematische Untersuchungen der Familie Gramineen;Avdulov;Supplement 43rd to the bull. of appl. bot. of genetics and plantbreeding,1931
4. Chromosome numbers of some arctic or boreal flowering plants;Böcher,1950
5. Meddelser om Grönland 147, 1-32.