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To see all available qualifiers, see our documentation.
http://en.wikipedia.org/wiki/UNIFAC
UNIFAC Consortium
Online calculator: http://ddbonline.ddbst.de/UNIFACCalculation/UNIFACCalculationCGI.exe
A UNIFAC-like online model (better functionality!) http://www.aiomfac.caltech.edu/index.html
Example of software which incorporates these and other models (many other examples) http://www.aspentech.com/products/aspen-plus.aspx