Butt, Mehmood, et al. “RIGHT VENTRICULAR OUTFLOW TRACT TACHYCARDIA AS A MODE OF PRESENTATION IN A COVID-19 PATIENT”. Journal of Ayub Medical College Abbottabad, vol. 33, no. 4, Oct. 2021, pp. 692-4, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/9846.