Book 6.1 Faculty of Natural Science and EducationBook 6.1 · Mathematics, Informatics and Phisics FRI-ONLINE-1-MIP-02 An Android App “From Tourists by Tourists” Cite Cite this paper× Citation styleAPA 7IEEEChicago Author–DateHarvardBibTeXRIS DownloadCopy Valentin Velikov, Petar Velikov