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Articles:

Harold C. Helgeson,
David H. Kirkham,
and George C. Flowers

Theoretical prediction of the thermodynamic behavior of aqueous electrolytes by high pressures and temperatures; IV, Calculation of activity coefficients, osmotic coefficients, and apparent molal and standard and relative partial molal properties to 600 degrees C and 5kb Am J Sci December 1, 1981 281:1249-1516; doi:10.2475/ajs.281.10.1249

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