Nur Zakiah Mohd Saat and  Abdul Aziz Jemain,  Moment Generating Functions of Observed Gaps between Hypopnea Using Saddlepoint Approximations.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2008, vol. 14(2). 153 - 158
    [viewed 19 March 2024]. Available from: https://publications.waset.org/pdf/7779.