1. Al-Safran, E., 2003. Experimental and theoretical investigation of slug flow characteristics along the valley of a Hilly-Terrain Pipeline, Ph.D. Dissertation, The University of Tulsa.
2. Email Communication with Taitel, Y;Al-Safran,2007
3. Investigation of slug flow characteristics in the valley of a hilly-terrain pipeline;Al-safran;Int. J. Multiph. Flow,2005
4. Regression diagnostics, identifying influential data and source of collinearity;Belsley,1980
5. Brandt, I., Fuchs, P., 1989. Liquid holdup in slugs: some experimental results from the SINTEF two-phase flow laboratory. BHRA Multiphase Proceedings, Nice, France.