Jaju, D. S.; Dikshit, M. B.; Balaji, J.; George, J.; Rizvi, S.; Al-Rawas, O. Effects of Pranayam Breathing on Respiratory Pressures and Sympathovagal Balance of Patients With Chronic Airflow Limitation and in Control Subjects. Sultan Qaboos Univ Med J 2011, 11, 221-229.