Consider the Cauchy problem
$$u_t -\epsilon \Delta (u) + f(x,t,u,\nabla u) = 0,$$ $$u(x,0) = g(x)$$
$(x,t) \in\mathbb{R}^n \times (0,\infty)$, $u:\mathbb{R}^n \to \mathbb{R}$, with $f$ at least continuous.
Can you point out a reference that has a detailed exposition of existence, uniqueness, and estimates of classical solutions for this problem?