Shlahi, Sattar A., and Zahra N. Al- Hattab. “The Genetic Effect of N-Methyl-N-Nitro-N-Nitrosoguanidine on Callus Induced from Mature Embryos of Beans Phaseolus Vulgaris”. Journal of Biotechnology Research Center, vol. 8, no. 4, Dec. 2014, pp. 79-84, doi:10.24126/jobrc.2014.8.4.389.