On Stephany's theory of origin of 1/f bulk noise

Summary Stephany's treatment is not correct since he neglects the friction force proportional to the velocity, which we show to be universal,i.e. present in any mechanism of electric conduction. Moreover his predicted power spectral density is in some cases three orders of magnitude larger than the observed one. Finally, his noise cannot be the true 1/f noise because it should predict a low cut-off of ∼5·10⁻² Hz due to the transit time of the electron-linked lattice (ELL) carriers through a distance of 20 μm while no cut-off has been observed down to 10⁻³ Hz.