00497naa#a2200169#i#450# EN\\bibl\56986 20250212122955.3 2542-1840 20230131b2023####ek#y0engy0150####ca RU Attention Span in Preteen Boys and Girl Journal article Kemerovo Kemerovo State University 2023 5 с. Journal article local Tsigichko Elena Aleksandrovna Krivoruchko Mayya Olegovna moloprom.kemsu.ru