Backward estimates for nonnegative solutions to a class of singular parabolic equations

In this paper we improve a recent result of the same Authors (Recalde and Vespri, 2015) by using the same approach in a more tricky way. More precisely, we study a class of quasilinear singular parabolic equations with L∞L∞ coefficients, whose prototypes are the pp-Laplacian (2NN+1