Saleh, Talib Abdula, and Duraid M.A. Al-Byatti. “Experimental Study of Pressure Drop During Multiphase (Water, Air and Sand) Flow in Horizontal Pipes”. Al-Nahrain Journal for Engineering Sciences, vol. 15, no. 1, Apr. 2012, pp. 108-20, https://nahje.com/index.php/main/article/view/641.