El-Shaib, Mohamed, Omar Keshk, and Mohamed Shehadeh. 2016. “Monitoring of Deep Groove Ball Bearing Defects Using the Acoustic Emission Technology”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 29 (2):237-47. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6263.