Ghanem, Sara N. Ghanem, and Sajida A. Abood Abood. “Effect of Sunflower (Helianthus Annuus L.) Seeds Treatment by Diode Laser Radiation in Seedlings and Calli Growth”. Journal of Biotechnology Research Center (JOBRC), vol. 9, no. 2, June 2015, pp. 21-30, doi:10.24126/jobrc.2015.9.2.428.