Sukamta, Endradi Roziantho, and Sudarja, “Experimental Study on Two-Phase Flow of Gas-Liquid With High Viscosity in Capillary with the Slope of 5o against Horizontal Position”, J. Adv. Res. Fluid Mech. Therm. Sc., vol. 69, no. 2, pp. 120–129, Mar. 2024.