Sutanto, Y S, Suradi ., and Samuel . 2019. “The Effects of Allopurinol on Glutathione Sulfhydryl (GSH) Serum Level, %FEV1, Six Minute Walking Test, and CAT Score of Chronis Obstructive Pulmonary Disease Patients”. KnE Life Sciences 4 (12), 85–95. https://doi.org/10.18502/kls.v4i12.4160.