Generalization of the Fedorova-Schmidt method for determining particle   size distributions
  One reports the integral transform that determines the particle size distribution of a given sample from the small-angle scattering intensity under the assumption that the particle correlation function is a polynomial of degree M. The Fedorova-Schmidt solution [J. Appl. Cryst. 11, 405, (1978)] corresponds to the case M = 3. The procedure for obtaining a polynomial approximation to a particle correlation function is discussed and applied to the cases of polidisperse particles of tetrahedral or octahedral or cubical shape. 
Salvino Ciccariello
cond-mat.mtrl-sci