FARHAD, Mohammad Hanif; SARIM, Hafiz Mohd; IDRUS, Bahari Bin. Procedural Database Normalization Level Validation for Electronic Certificate Issuance. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 16, n. 1, p. 251–260, 2014. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2286. Acesso em: 13 oct. 2025.