O. M. Goroshkina, M. M. Hreb, I. O. Goroshkin, and S. O. Karaman, “FUNCTIONS OF QR-CODES IN THE STRUCTURE OF UKRAINIAN LANGUAGE TEXTBOOKS”, ITLT, vol. 78, no. 4, pp. 32–46, Sep. 2020, doi: 10.33407/itlt.v78i4.3360.