Sukamta, Noviyanto, Sudarja, and Sri Sundari. “Void Fraction Features Using Image Processing on a Clear Capillary Pipe With a 45° Slope to The Horizontal Line of Two-Phase Air-Liquid Flow With High Viscosity”. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 83, no. 2, Mar. 2024, pp. 164-72, https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/7792.