Raju, D.S.S.K., Munta, A.K. and Lalitha, D.L. 2021. A study on the serum arginase and nitrate levels in association with Fev1/Fvc ratio in chronic obstructive pulmonary disease. International journal of health sciences. 6, S9 (Sep. 2021), 4803–4811. DOI:https://doi.org/10.53730/ijhs.v6nS9.14067.