Dear Rietveld users,
                    Can anyone please help me by giving some references about 
the detailed mathematical methods used in GSAS to calculate the electron 
density from an X Ray profile? mainly the detailed mathematical backgrounds 
about the routines FOBS, FOURIER and FORSRH are very much required to me... 
Thanking you all,

Prasun Sharma Chowdhury
Senior Research Fellow
Variable Energy Cyclotron Centre
1/AF, Bidhan Nagar, Kolkata 
PIN 700064
West Bengal, India

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