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2. The kinetics of nutrient uptake by tomato plants in water culture system;Ben-Asher;Agron. J.,1982
3. An analogue isolator is simple and reliable;Ben-Yaakov;Electron. Eng.,1979
4. Crop production with nutrient film technique;Cooper,1976
5. In situ conductivity measurement using low frequency squarewave AC;Dauphinee,1968