E. Happ and  A. Albert Tóth,  Opportunities of an Industrial City in the Leisure Tourism.   journal   = {International Journal of Social and Business Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2017, vol. 130(10). 2510 - 2518
    [viewed 11 December 2019]. Available from: https://publications.waset.org/pdf/10008225.