GSAS for large “restraint” Rietveld refinements of polymeric inorganics
by Bob von Dreele and Alan Larsen - ftp://ftp.lanl.gov/public/gsas/
EXPGUI GSAS Graphical user interface by Brian Toby
- http://www.ncnr.nist.gov/programs/crystallography/software/expgui/
CCP14 based resources:
- http://www.ccp14.ac.uk/solution/gsas/
What may look like minor changes can result in ability to handle what were intractable problems.