MAMATKULOV , Gulom. PORTFOLIO OF POSTAL SERVICES AND THE ECONOMIC EFFICIENCY OF ITS DIGITALIZATION. Innovation Science and Technology, Tashkent, Uzbekistan, v. 2, n. 5, 2026. DOI: 10.5281/zenodo.20093318. Disponível em: https://www.ist-journal.uz/index.php/IST/article/view/801. Acesso em: 13 oct. 2026.