Al-Hilli, Ali H., and Thaier J. Ntayeesh. “Free Vibration Characteristics of Elastically Supported Pipe Conveying Fluid”. Nahrain University College of Engineering Journal, vol. 16, no. 1, June 2017, pp. 9-19, https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/233.