What is a good and modern reference for hölder regularity for non-degenerate parabolic equations? To be a bit more precise, I have a degenerate parabolic equation, exhibiting two degeneracies, and can do the whole stuff with energy and logarithmic estimates to reduce the oscillation if it is large. For these estimates, I exploit a certain growth of some functions near its sup and inf (there the degeneracies occur). However, during that process one reaches the case where no or at most one degeneracies occur and I'm not able to use the growth of these functions.
Hence, I need to adapt the process and the cylinders occuring in the procedure (and potentially I might even forget in the case of no degeneracies the logarithmic estimates?). Any recommendations?