1. Aase, H. C. andPowers, L. (1926). “Chromosome numbers in crop plants.”Amer. Journ. Bot. 13, 367–72.
2. Andersen, S. (1931). “Graes-hybrider i Denmark.”Botanisk Tidsskrift,41, 424–30.
3. Armstrong, S. F. (1917).British Grasses and their Employment in Agriculture. 199 pp. Cambridge Univ. Press.
4. Ascherson, P. (1864). “Noch einige Worte überFestuca loliacea Auct.”Botanische Zeitung,22, 125–7.
5. Ascherson, P. andGraebner, P. (1900–2).Synopsis der mitteleuropäischen Flora,2. Leipzig.