H. KHDHEYER, F. Role of the Caffeine (1,3,7 trimethylxanthine) on Callus Initiation, Growth and Differentiation from Hypocotyls of Sun Flower Helianthus annuus L. Rafidain Journal of Science, [S. l.], v. 21, n. 7, p. 87–105, 2010. DOI: 10.33899/rjs.2010.35152. Disponível em: https://jamh.uomosul.edu.iq/index.php/rsci/article/view/47413. Acesso em: 28 sep. 2025.