E. KOUDELKOVÁ, A. GROŠPIC, and P. NIEDERLE, “Echocardiography in the follow-up of patients with prosthetic heart valves”, Arch. Acoust., vol. 9, no. 1-2, pp. 267–274, Jul. 2015, Accessed: Apr. 28, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3223