SINYTSKYI, M. 2021. Electoral Systems in the Digital Age: Underlying Challenges and New Opportunities Part I. A Review of the Problems, Classic Protocols of Collective Choice. Scientific Bulletin of the National Academy of Statistics, Accounting and Audit. 4 (Nov. 2021), 113-124. DOI:https://doi.org/10.31767/nasoa.4-2020.13.