References
- Ellenberg, H., 1978: Vegetation Mitteleuropas mit den Alpen in ökologischer Sicht. 2nd ed. Ulmer, Stuttgart. 981 pp. 3rd & English eds. available.
- Landot, E., 1977: Oekologische Zeigerwerte zur Schweizer Flora. Veröff. Geobot. Inst. ETH, Stiftung Rübel, in Zürich 64. 208 pp.
- Ramenski, L. G., Tsatsenkin, I. A., Chizhikov, O. N., and Antinina, N. A., 1956: [Ecological evaluation of grazing lands by means of their plant cover.] Gosudarstvennoi izd. Selskokhoz. Liter., Moscow. 472 pp.