  Viscoelastic description of the electron subsystem of a semi-bounded metal on
the basis of the generalized "jellium" model using the method of nonequilibrium
statistical Zubarev operator is proposed. The nonequilibrium statistical
operator and the quasi-equilibrium partition function calculated by means of
the functional integration method are obtained. Transport equations for
nonequilibrium mean values of electron density and momentum are received in the
Gaussian approximation and in the following higher approximation that
corresponds to the third-order cumulant averages in calculation of the
quasi-equilibrium partition function.
