Güner, A., and G. Kahveci. “Two- and Three-Dimensional Echocardiography in the Evaluation of the Paravalvular Regurgitation of the Mitral Valve Annuloplasty Ring”. The Journal of Tehran University Heart Center, Vol. 13, no. 4, Oct. 2018, pp. 191-2, http://jthc.tums.ac.ir/index.php/jthc/article/view/779.