In the article the photoconductivity oscillations are determined by interplay between the stimulated emission processes and the quasielastic energy relaxation and are specified by nonequilibrium energy distribution. Due to an high recombination effects at low-energy carriers their energy distribution exhibits an oscillation shape. Hence we have found neutrino-like shape with respect to pumping intensity response. The photoconductivity appears to be proportional to the concentration of the photogenerated carriers for the case of short-range momentum relaxation. This concentration as well as the photoconductivity decrease with the temperature and the energy of the photoexcitation. The authors  demonstrate that the Joule heating effects which have been described by hyperbolic equation for heat conductivity caused by a high frequency ac electric current in multi-layer graphene creates a pronounced temperature gradient in a ferroelectric substrate which are critical for understanding of the complex physical thermal and electrical processes taking place across and along graphene-ferroelectric interface at terahertz frequencies. But the thermal effects along graphene plane were not considered before notwithstanding on the appearance of research articles .