S. Ali and  M. Baccar,  Performance Study of Scraped Surface Heat Exchanger with Helical Ribbons.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2016, vol. 120(12). 1936 - 1942
    [viewed 10 December 2019]. Available from: https://publications.waset.org/pdf/10006104.