  This paper develops solutions of fractional Fokker-Planck equations
describing subdiffusion of probability densities of stochastic dynamical
systems driven by non-Gaussian L\'evy processes, with space-time-dependent
drift, diffusion and jump coefficients, thus significantly extends Magdziarz
and Zorawik's result in "M. Magdziarz and T. Zorawik, Stochastic representation
of fractional subdiffusion equation. The case of infinitely divisible waiting
times, L\'evy noise and space-time-dependent coefficients. Proc. Amer. Math.
Soc., Accepted (2015)." Fractional Fokker-Planck equation describing
subdiffusion is solved by our result in full generality from perspective of
stochastic representation.
