Shlahi, Sattar A., and Zahra N. Hashim Al- Hattab. “Effect of N-Methyl-N-Nitro-N-Nitrosoguanidine (NTG) on Callus Induction and Survival Rate on Mature Embryos of Beans (Phaseolus Vulgaris)”. Journal of Biotechnology Research Center, vol. 3, no. 2, June 2009, pp. 91-98, doi:10.24126/jobrc.2009.3.2.76.