Czernek, Krystian, and Patryk Okoń. “Verification of Methods for Calculating the Gas Volume Fraction in the Vertical Descending Flow of Two-Phase Gas-Liquid Mixtures”. Journal of Mechanical and Energy Engineering 2, no. 4 (December 21, 2018): 293-300. Accessed December 10, 2022. https://jmee.tu.koszalin.pl/ojs/index.php/jmee/article/view/81.