Preface: Special Issue Dedicated to the Memory of Prof. Donggao Deng’s 90th Birthday (Part I). Analysis in Theory and Applications, [S. l.], v. 41, n. 4, p. i-iii, 2026. DOI: 10.4208/ata.2025.v41n4.preface. Disponível em: https://global-sci.com/ata/article/view/23624. Acesso em: 10 mar. 2026.