N. Satheesh Kumar, K. J. . “‘Lub and Dub’: An Optimized Approach for Heart Disease Classification Based on Heart Sound Using Bi-LSTM”. International Journal of Intelligent Systems and Applications in Engineering, vol. 12, no. 3, Mar. 2024, pp. 2635-42, https://ijisae.org/index.php/IJISAE/article/view/5736.