Farhad MH, Sarim HM, Idrus BB. Procedural Database Normalization Level Validation for Electronic Certificate Issuance. IJSBAR [Internet]. 2014 Jun. 1 [cited 2025 Sep. 13];16(1):251-60. Available from: https://gssrr.org/JournalOfBasicAndApplied/article/view/2286