McCrary, Andrew W., Cooper Moore, Sydney D. Collins, Gregory M. Sturgeon, Melissa Lefevre, Olaf T. von Ramm, and Piers C.A Barker. “The Fourth Heart Sound Revisited: Assessing Cardiographics Associated With Late Diastolic Propagating Events Using High Frame Rate Echocardiography”. Cardiology and Cardiovascular Medicine 9, no. 3 (May 29, 2025): 173–176. Accessed June 21, 2026. https://fortunejournals.org/ojs/index.php/ccm/article/view/16600.