Sudarja, S., and S. Sukamta. “Experimental Study on Flow Pattern and Void Fraction of Air-Water and 3 % Butanol Two-Phase Flow in 30o Inclined Mini Channel”. Journal of Advanced Research in Experimental Fluid Mechanics and Heat Transfer, vol. 1, no. 1, Oct. 2020, pp. 11-20, https://www.akademiabaru.com/submit/index.php/arefmht/article/view/1085.