R. Krishna kumar, A. Kingsly Jabakumar, S. Syed Althaf, J. Saranraj, T. Arun, U. Rujeyanthi. 2023. “Designing of Portable Long Duration HRV Recorder”. Mathematical Statistician and Engineering Applications 71 (4):8208-19. https://doi.org/10.17762/msea.v71i4.1449.