Soo- Young Ye and Dong-Hyun Kim, Development of Position Changing System for Obstructive Sleep Apnea Patient using HRV. journal = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology. July 2012, vol. 67(7). 330 - 332 [viewed 18 September 2024]. Available from: https://publications.waset.org/pdf/15105.