X. Fernandez-Real, X. Ros-Oton, Regularity Theory for Elliptic PDE,
Zurich Lectures in Advanced Mathematics. EMS books (2022), 234 pp.
REGULARITY AND SINGULARITIES IN ELLIPTIC PDE'S: BEYOND MONOTONICITY FORMULAS
X. Fernandez-Real, X. Ros-Oton, Regularity Theory for Elliptic PDE,
Zurich Lectures in Advanced Mathematics. EMS books (2022), 234 pp.