Al- Assaf, Mohamad Ali, et al. “EFFECT OF SPRAYING GIBBERELLIC ACID AND NITROGEN ON TWO TYPES OF POTATOES VAR. ALASKA ”. Diyala Agricultural Sciences Journal , vol. 5, no. 2, Dec. 2013, pp. 384-95, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/2761.