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 (Jan. 2023), 8208–8219. DOI:https://doi.org/10.17762/msea.v71i4.1449.