“…These kind of problems, coming from applied sciences, describe anomalous diffusion in disordered materials or with memory effects. For instance, the first equation is a perturbation by means of a nonlocal forcing term of the diffusion of particles verifying a generalized Fick's second law, for other kind of perturbation we refer to [1] and [32]. Important applications include viscoelasticity and seismic-wave theory, diffusion in turbulent plasma, fractal media and porous media (see, e.g., [19] and the references therein).…”