1. Barber, D.A.: Dual isotherms for the absorption of ions by plant tissues. New Phytol. 71, 255?262 (1972)
2. Clarkson, D.: Ion transport and cell structure in plants. Maidenhead, U.K.: McGraw Hill 1974
3. Epstein, E.: Dual patterns of ion absorption by plant cells and by plants. Nature 212, 1324?1327 (1966)
4. Epstein, E.: Kinetics of ion transport and the carrier concept. In: Encycl. Plant Physiol., N.S., Vol. 2, Transport in plants, pt. IIB, pp. 70?94, Lüttge, U., Pitman, M.G., eds.. Berlin-Heidelberg-New York: Springer 1976
5. Glass, A.D.M.: The regulation of potassium absorption in barley roots. Plant Physiol. 56, 377?380 (1975)