Thorsten Herrmann and  Alexander Laukemann and  Hansgeorg Binz and  Daniel Roth,  The Emoji Method: An Approach for Identifying and Formulating Problem Ideas.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2018, vol. 144(12). 1071 - 1086
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10009886.