محمد علي ا. Citric acid production by pellet growth ofAspergillus niger. College of Basic Education Research Journal, [S. l.], v. 4, n. 4, p. 311–318, 2007. DOI: 10.33899/berj.2007.Vol4.Iss4.39189. Disponível em: https://berj.uomosul.edu.iq/index.php/berj/article/view/39189. Acesso em: 28 dec. 2025.