[Changes in the mental work capacity of pupils in the lower grades in the course of the school year].
D002648:Child; D006613:Higher Nervous Activity; D006801:Humans; D008606:Mental Processes / Q000502:physiology*; D013997:Time Factors; D014455:Ukraine
Izmenenie umstvennoĭ rabotosposobnosti uchashchikhsia nachal'nykh klassov v techenie uchebnogo goda.