%0 Book Section
%U https://doi.org/10.1515/9780691213033-008
%B Introduction to Partial Differential Equations
%B Second Edition
%T Chapter 6. THE L2 THEORY OF DERIVATIVES
%A Gerald B. Folland
%D 2020
%I Princeton University Press
%C Princeton
%P 190-227
%R doi:10.1515/9780691213033-008
%@ 9780691213033
%[ 2026-05-07