  The anomalous temperature variation of the thermoelectric power in the
f-electron metallic compounds, namely the sign reversal or the maxima, is
sometimes interpreted as resulting from the conduction electrons scattering in
Born approximation on the acoustic phonons and on the localized spins in the
s-f exchange interaction. The experimenters rely on the results of some
theoretical works where such thermoelectric power behavior was obtained within
these simple models. In the present paper we prove that neither the
electron-phonon scattering nor the magnetic s-f scattering in the Born
approximation (nor both of them) do lead to the effects mentioned above.
