00770naa#a2200193#i#450# EN\\bibl\101124 20251029023101.3 1994-4683 20251027b2025####ek#y0engy0150####ca RU Loneliness index among athletes as a factor influencing quality of life and sporting success Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2025 6 с. Journal article local Прочие вопросы психологии. 159.99 Прикладная психология. 15.81 grnti Korshunova Ol'ga Valentinovna Yalysheva El'mira Rushanovna uchzapiski.lesgaft.spb.ru