title: [Working capacity dynamics of 4th grade pupils during foreign language study].
mesh_terms: D001288:Attention; D002648:Child; D006801:Humans; D005222:Mental Fatigue; D012572:School Health Services; D014792:Visual Acuity
vernacular_title: K voprosu o dinamike rabotosposobnosti uchashchikhsia 4-go klassa pri izuchenii inostrannogo iazyka.