JAFFER , A. P. N. T. “EFFECTOFSIWAK EXTRACTSON THE HARDNESSPROPERTY OF VINYL ADDITION CURED SILICONE MAXILLOFACIAL PROSTHETIC MATERIAL”. Journal of Duhok University, Vol. 22, no. 1, Jan. 2020, pp. 42-48, doi:10.26682/sjuod.2020.22.1.6.