The document "selfi_grup_charovnica_2021" appears to be a specific dataset or internal report regarding group selfie behaviors within a Slavic-language context rather than a widely published academic paper. It is likely a case study or student project found in university repositories or on platforms like VK (Vkontakte) concerning digital community habits. To locate this document, search platforms like ResearchGate, Academia.edu, or university portals using the specific subject or author name.