Studying the Factors Effect on the Flowability of (ZnO – CuO/ Al2O3) Catalyst with Blending of Different Lubricants through Hopper. Al-Khwarizmi Engineering Journal, [S. l.], v. 5, n. 4, p. 18–24, 2009. Disponível em: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/579. Acesso em: 30 apr. 2025.