Pribadi, Wisnoe, et al. “Ventricle Dyssynchrony in Right Ventricle Apex and Right Ventricle Outflow Tract Pacing: Evaluation by Tissue Doppler Imaging”. Indonesian Journal of Cardiology, vol. 28, no. 6, June 2013, pp. 424-30, doi:10.30701/ijc.v28i6.208.