Bezerra, Flank D. M., Alexandre N. Carvalho, Lucas A. Santos, and Carlos R. Takaessu jr. “Spectral Analysis for Some Third-Order Differential Equations: A Semigroup Approach”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 26, no. 2 (July 7, 2025): 1071-1100. Accessed February 20, 2026. https://journals.sns.it/index.php/annaliscienze/article/view/6068.