Hossen, A., B. Al Ghunaimi, and M.O. Hassan. 2006. “Statistical Signal Characterization of Spectral Analysis of Heart Rate Variability for Screening of Patients With Obstructive Sleep Apnea”. The Journal of Engineering Research [TJER] 3 (1):1-9. https://doi.org/10.24200/tjer.vol3iss1pp1-9.