The phenomenological motivations, the expressions and the comparison with
experiment of the parton distributions inspired by the quantum statistics are
described. The Fermi-Dirac expressions for the quarks and their antiparticles
automatically account for the correlation between the shape and the first
moments of the valence partons, as well as the flavor and spin asymmetries of
the sea. One is able to describe with a small number of parameters both
unpolarized and polarized structure functions.Comment: 7 pages, 3 figures, Invited talk at XX International Workshop on
"`Deep-Inelastic Scattering and related subjects"', University of Bonn,
Germany, March 26-30 2012, presented by F. Buccella, to appear in the
conference proceeding
