1.
Saxena J, Gupta S, Saxena S. "A study of change of posture on the pulmonary function tests : can it help copd patients ?". Indian J Community Health [Internet]. 2006 Jun. 30 [cited 2024 May 2];18(1):10-2. Available from: https://iapsmupuk.org/journal/index.php/IJCH/article/view/108