Sreekumar A, Kiran Kumar. Using a peak flow meter to assess severity of exacerbation in patients suffering from chronic obstructive pulmonary disease: a prospective observational study. Int J Res Med Sci [Internet]. 2023 Apr. 11 [cited 2025 Oct. 14];11(5):1526-30. Available from: https://www.msjonline.org/index.php/ijrms/article/view/11920