Hamad, M . S ., I. A. Hamza, and S . A . Al-Muktar. “Influence of Sucrose and Tyrosine on Callus Induction and Morphine and Codeine Production on Papaver Somniferum In Vitro”. Journal of Biotechnology Research Center 4, no. 2 (June 1, 2010): 45–53. Accessed May 21, 2025. https://www.jobrc.org/index.php/jobrc/article/view/120.