Rumanti, Erika Rizky. 2018. “Measurement Of The Stenosis Mitral by Using The Method Flow Convergence Or Proximal Isovelocity Area (PISA) And Planimetri”. ARKAVI [Arsip Kardiovaskular Indonesia] 3 (2):211-2013. https://journal.uhamka.ac.id/index.php/arkavi/article/view/5482.