Yasuo Obikane,  Research on the Correlation of the Fluctuating Density Gradient of the Compressible Flows.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 1597 - 1600
    [viewed 07 May 2024]. Available from: https://publications.waset.org/pdf/13412.