(84) Guth, J. A., (1985), „Adsorption/desorptio“, in Joint International Symposium, Physicochemical Properties and their Role in Environmental Hazard Assessment, July 1 – 3, Canterbury, UK. (85) Soil Texture Classification (US and FAO systems): Weed Science, 33, Suppl. 1 (1985) and Soil Sci. Soc. Amer. Proc. 26:305 (1962).