M. K. . Al –Mallah and S. A. . Al- Kader, “Electro-conjugation between Klebsiella pneumoniae and Proteus mirabilis and between Agrobacterium rhizogenes R1601 and Sinorhizobium meliloti”, JOBRC, vol. 6, no. 1, pp. 80–87, Jan. 2012.