The form-factor anyalsis used by X+ are presented and derived in:

Solution X-ray scattering form factors of supramolecular self-assembled structures

The program of X+ is described in:

X+: a comprehensive computationally accelerated structure analysis tool for solution X-ray scattering from supramolecular self-assemblies

The method for computing arbitrary electron density profiles and plydispersity distributions in X+ is described in:

Please cite those papers if you are using X+

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