WASET
    Lili Chen and  Chao Yuan,  Module and Comodule Structures on Path Space.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2016, vol. 111(3). 151 - 155
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10005391.