Stoyan Nedeltchev and  Markus Schubert,  Entropy Analysis in a Bubble Column Based on Ultrafast X-Ray Tomography Data.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 110(2). 271 - 274
    [viewed 28 May 2022]. Available from: https://publications.waset.org/pdf/10004308.