Madegedara, D., K. Kulathunga, and S. Nakandala. “Retrospective Analysis of Use of Empiric Anit Tuberculosis Treatment in Smear Negative Pulmonary Tuberculosis Patients in Central Sri Lanka”. SAARC Journal of Tuberculosis, Lung Diseases and HIV/AIDS, vol. 7, no. 2, Mar. 2011, pp. 15-18, doi:10.3126/saarctb.v7i2.4400.