Arendt, Wolfgang, and Reiner Schätzle. “Semigroups Generated by Elliptic Operators in Non-Divergence Form on Unbounded Domains”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE (August 17, 2026): 26. Accessed August 29, 2026. https://journals.sns.it/index.php/annaliscienze/article/view/7363.