Li, Wei-Xi. “Compactness Criteria for the Resolvent of the Fokker-Planck Operator”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 18, no. 1 (March 29, 2018): 119-143. Accessed February 20, 2026. https://journals.sns.it/index.php/annaliscienze/article/view/562.