Imaging Three Dimensional Two-particle Correlations for Heavy-Ion   Reaction Studies
  We report an extension of the source imaging method for analyzing three-dimensional sources from three-dimensional correlations. Our technique consists of expanding the correlation data and the underlying source function in spherical harmonics and inverting the resulting system of one-dimensional integral equations. With this strategy, we can image the source function quickly, even with the finely binned data sets common in three-dimensional analyses. 
D.A. Brown, P. Danielewicz, A. Enokizono, M. Heffner, R. Soltz, S.   Pratt