Y. Zheng et al., DETERMINATION OF 3-DIMENSIONAL LOW-RESOLUTION VIRAL STRUCTURE FROM SOLUTION X-RAY-SCATTERING DATA, Biophysical journal, 69(2), 1995, pp. 619-639
The capsid is modeled as a region of constant electron density located
between inner and outer envelopes that exhibit icosahedral symmetry.
For computational purposes the envelopes are represented as truncated
sums of weighted icosahedral harmonics. Methods are described for esti
mating the weights from x-ray solution scattering patterns based on no
nlinear least squares, and two examples of the procedure, for viruses
with known atomic-resolution structures, are given.