1. Andersson M 1988 Toxicity and tolerance of aluminium in vascular plants. Water, Air, Soil Pollut. 39, 439–462.
2. Burström H G and Svensson S B 1972 Hormonal regulation of root growth and development. In Hormonal Regulation in Plant Growth and Development. Eds. H Kaldewey and Y Vardar. pp 125–136. Verlag Chemie, Weinheim, Germany
3. Crossett R N and Campbell J D 1971 The effect of ethylene on the development of the barley system. Annual Report, Letcombe Lab. Arc, UK. 173 p.
4. Cíikovâ R 1989 Changes in root system morphology of spruce (Picea abies (L.) Karst.) owing to aluminium. In Proc. Vth Days of Plant Physiology. pp 195. Ed. J E Purkyné. Univ. Fac. Nat. Sci. Brno, The Czech Republic. (In Czech).
5. Cíikovâ R 1990 Acidification stress of root environment as related to endogenous cytokinins and gibberellins in oak seedlings. Biol Plant. 32, 97–103.