Jan Cernohorsky,  Correlation of the Rate of Imperfect Competition and Profit in Banking Markets.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 108(12). 4351 - 4354
    [viewed 05 August 2020]. Available from: https://publications.waset.org/pdf/10003617.