Mallik, B., S. Ferdousi, and S. Sultana. “Effect of Music Therapy on Heart Rate Variability in Generalized Anxiety Disorder: A Poincaré Analysis”. Journal of Bangladesh Society of Physiologist, vol. 15, no. 1, July 2020, pp. 39-45, doi:10.3329/jbsp.v15i1.48113.