Preface: Special Issue Dedicated to the Memory of Prof. Donggao Deng’s 90th Birthday (Part II). Analysis in Theory and Applications, [S. l.], v. 42, n. 1, p. i-iii, 2026. DOI: 10.4208/ata.2026.v42n1.preface. Disponível em: https://global-sci.com/index.php/ata/article/view/23625. Acesso em: 27 feb. 2026.