Marchon, Niyan, and Gourish Naik. “Linear Phase FIR Filter to Compute Fetal Heart Rate Variability”. International Journal of Engineering & Technology 7, no. 4.5 (September 22, 2018): 492–496. Accessed May 5, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/21141.