DRĂGAN, Simion. “HYDRODYNAMIC CHARACTERIZATION OF THREE PHASE FLUIDIZED BED”. Studia Universitatis Babeș-Bolyai Chemia, vol. 60, no. 3, Sept. 2015, pp. 183-91, https://studia.reviste.ubbcluj.ro/index.php/chemia/article/view/8479.