S. Ahmad, Ajmal Khan, Muzamil Mahmood, Waqar Kabir, Sajjad Ahmad, and Syed Nadeem Badshah, “FREQUENCY OF TYPE-II RESPIRATORY FAILURE IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE”, IJHR, vol. 2, no. 2 (Health & Rehab), pp. 170–175, Nov. 2024, doi: 10.71000/ijhr124.