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- [32] ISOTOPE EXCHANGE STUDIES ON SILICATE ION EXCHANGE MATERIAL .6. BA ISOTOPE EXCHANGE BETWEEN ZEOLITE A AND AQUEOUS SOLUTIONS AT TEMPERATURES UP TO 180 DEGREES C USING A NEW EXPERIMENTAL METHOD ZEITSCHRIFT FUR NATURFORSCHUNG PART A-ASTROPHYSIK PHYSIK UND PHYSIKALISCHE CHEMIE, 1968, A 23 (06): : 813 - &