K. C. . Das, S. . Ferdousi, S. F. H. Urmi, M. . Mostafa, and . S. F. . Tonni, “Effect of Slow Breathing Exercise on Time Domain Heart Rate Variability in Transfusion Dependent Thalassemic Patients”, Bangabandhu Sheikh Mujib Medical Coll J, vol. 1, no. 2, pp. 65–69, Oct. 2023.