Nguyen, T.-L. and Tran, Q.-H. 2026. Constructing waveform of P, Q, R, S, and T waves in ECG signals for cardiovascular disease diagnosis. HPU2 Journal of Science: Natural Sciences and Technology. 5, 01 (Apr. 2026), 65–75. DOI:https://doi.org/10.56764/hpu2.jos.2026.5.01.65-75.