Mr. Vinayak Kurale, Dr. Archana D. Methe, Miss. Smruti Umesh Kurulkar, and Dr. Gloria Naik, “TO COMPARE THE EFFICACY OF BUTEYKO BREATHING EXERCISE AND 90/90 BALL & BALLON BREATHING EXERCISE IN PATIENTS WITH STAGE 1 AND STAGE 2 CHRONIC OBSTRUCTIVE PULMONARY DISEASE”., J Popl Ther Clin Pharmacol, vol. 33, no. 1, pp. 558–568, Jan. 2026, doi: 10.53555/gt22qp49.