Fathy, S. A., Mohamed, M. R., Elhady, M. M. and Al-habal, M. H. (2016) “Isolation and biochemical characterization of a novel antimicrobial agent produced by Streptomyces violaceusniger isolated from Yemeni soil”, International Journal of Research in Medical Sciences, 4(1), pp. 22–32. doi: 10.18203/2320-6012.ijrms20160004.