Abdulkadir, M. , Hernandez-Perez, V. , Sharaf, S. , Lowndes, I. , Azzopardi, B. (2010), 'Experimental Investigation of Phase Distributions of Two-phase Air-silicone Oil Flow in a Vertical Pipe', World Academy of Science, Engineering and Technology, Open Science Index 37, International Journal of Chemical and Molecular Engineering, 4(1), 18 - 25.