A Study of Fluctuation and Expansion Ratios for Gas-Solid Fluidized Columns. Journal of Engineering, [S. l.], v. 26, n. 10, p. 15–34, 2020. DOI: 10.31026/j.eng.2020.10.02. Disponível em: https://www.joe.uobaghdad.edu.iq/index.php/main/article/view/1194. Acesso em: 26 apr. 2025.