There are many interesting papers at the "RMC Modelling Internet
Conference 1997" at :
http://www.studsvik.uu.se/rmc/confa1.htm
One is of particular interest to Rietveld users entitled "RMC modelling
of Neutron Powder Diffraction Data" at :
http://www.studsvik.uu.se/rmc/conference/papers/mellergard/meller.htm
The hypertext version starts by the statement : "Rietveld refinement (RR)
has been used for many years, with great success, to model neutron
powder diffraction data. Why do we need another method ?" (....).
The discussion is open...
Armel Le Bail, Laboratoire des Fluorures, CNRS UPRES-A 6010
Faculte des Sciences, Universite du Maine, F-72085 Le Mans Cedex 9, France