“ The Effect of the Nutrient Medium Enhanced by Plant Growth Regulators on the Inducting and Growing of Callus from Digitalis Purpurea Leaves”. Damascus University Journal for the basic sciences 38, no. 3 (September 5, 2022). Accessed June 18, 2026. https://journal.damascusuniversity.edu.sy/index.php/basj/article/view/6031.