Jun Gil Ahn and  Jong Kang Park and  Jong Tae Kim,  Investigating Activity Recognition Using 9-Axis Sensors and Filters in Wearable Devices.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2016, vol. 117(9). 1213 - 1216
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10005365.