MOHAMMED ABID MOMIN. SAP S/4 HANA SYSTEM UPGRADE: A COMPREHENSIVE IMPLEMENTATION GUIDE WITH PRE, DURING, AND POST-UPGRADE BEST PRACTICES. INTERNATIONAL JOURNAL OF COMPUTER ENGINEERING AND TECHNOLOGY, [S. l.], v. 16, n. 01, p. 424–437, 2025. Disponível em: https://ijcet.in/index.php/ijcet/article/view/227.. Acesso em: 18 mar. 2026.