00683naa#a2200169#i#450# EN\\bibl\127516 20260710080152.5 1994-4683 20230930b2023####ek#y0engy0150####ca RU INFLUENCE OF ANXIETY ON STUDENT PRODUCTIVITY Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2023 4 с. Journal article local Психологические исследования, опыты, эксперименты, тесты, измерения. 159.9.072 Pitkin Viktor Aleksandrovich uchzapiski.lesgaft.spb.ru