00827naa#a2200205#i#450# EN\\bibl\109510 20260409152501.4 1994-4683 20240229b2024####ek#y0engy0150####ca RU Features of adaptation of younger adolescents during the transition from primary school to basic school general education Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2024 3 с. Journal article local Педагогическая психология. 37.015.3 Stepchenko Tat'yana Aleksandrovna Savin Aleksandr Vyacheslavovich Seraya Galina Vladimirovna Simukova Svetlana Vasil'evna uchzapiski.lesgaft.spb.ru