WASET
    Barbora Haltofová,  Implementation of Geo-Crowdsourcing Mobile Applications in e-Government of V4 Countries: A State-of-the-Art Survey.   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 125(5). 580 - 584
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10007116.