BHARATHI, A. R. “A STUDY TO ASSESS THE RESPIRATORY STATUS OF PATIENTS WHO HAVE UNDERGONE CARDIO THORACIC AND VASCULAR SURGERY DURING PRETEST”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 42, no. 24, Dec. 2021, pp. 289-92, https://mbimph.com/index.php/UPJOZ/article/view/2694.