Akbari, F., A. Arminian, D. Kahrizi, and A. Fazeli. “Effect of Nitrogen Sources on Some Morphological Characteristics of in Vitro Stevia Rebaudiana Bertoni”. Cellular and Molecular Biology, vol. 63, no. 2, Feb. 2017, pp. 107-11, doi:10.14715/cmb/2017.63.2.17.