Jianmin Xing Wei Shao,  n− Strongly Gorenstein Projective, Injective and Flat Modules.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2013, vol. 74(2). 255 - 258
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/16764.