Cristian P─âuna,  Price Prediction Line, Investment Signals and Limit Conditions Applied for the German Financial Market.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 472 - 481
    [viewed 20 November 2019]. Available from: https://publications.waset.org/pdf/10010724.