Alwash , Bushra M. Jaber Alwash, and Zena H. Jazar Jazar. “Increasing the Production of Spilanthol in Spilanthes Acmella (L.)Murr. By Using Tissue Culture Techniques”. Journal of Biotechnology Research Center, vol. 9, no. 2, June 2015, pp. 31-38, doi:10.24126/jobrc.2015.9.2.431.