F. Shareef, W., and N. F. Mossa. “PCA Classification of Vibration Signals in WSN Based Oil Pipeline Monitoring System”. Journal of Al-Qadisiyah for Computer Science and Mathematics, Vol. 11, no. 1, Jan. 2019, pp. Comp Page 60 -71, doi:10.29304/jqcm.2019.11.1.469.