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- [8] NUMBER OF EXTRACTIONS IN DETERMINATION OF EFFECTIVE CATION-EXCHANGE CAPACITY JOURNAL OF AGRICULTURAL SCIENCE IN FINLAND, 1986, 58 (02): : 47 - 51
- [9] REGARDING THE DETERMINATION OF CATION-EXCHANGE CAPACITY OF SOILS WITH BARIUM ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE, 1992, 155 (01): : 25 - 27