We address the problem of extracting single-nucleon momentum distributions n(p) from inclusive lepton scattering data. A model for these relates nuclear and nucleon structure functions (SF) through an intermediate SF f~(PN) of a nucleus of point-particles. In addition to the asymptotic limit (AL), f~(PN) contains, generally q-dependent, Final State Interactions (FSI) parts. In the inverse problem we employ the structure of the theory, but no numerical results, in order to separate q-dependent FSI from the AL, which depends on n(p). It appears that in the q-range of the analyzed lepton data, the FSI are only weakly q-dependent, making it virtually impossible to obtain parameters in a free fit of the parametrized components of f. Imposing we obtain n(p) for Fe and ~4He.
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