SADEQ ABDULRAZZAQ, Burhan. Gas Holdup and liquid Phase RTD Studies in Multistage Bubble Columns. Journal of Engineering and Sustainable Development, Baghdad, Iraq, v. 16, n. 1, p. 326–340, 2012. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1182.. Acesso em: 13 jun. 2026.