Larry Powell and  Seth Polsley and  Drew Casey and  Tracy Hammond,  Improving Activity Recognition Classification of Repetitious Beginner Swimming Using a 2-Step Peak/Valley Segmentation Method with Smoothing and Resampling for Machine Learning.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2023, vol. 203(11). 611 - 618
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10013342.