M. S. Musharaf, S. A. S. Zaman, U. Usman, A. Javaid, and F. H. Zahid Chaudery, “Frequency Of Rifampicin Resistance Among Sputum Smear Negative Pulmonary Tuberculosis Cases By Real Time PCR”, Pak J Chest Med, vol. 27, no. 1, pp. 20–24, Aug. 2021.