[On mental hygiene of recreation of 10 to 14-year-old children].
D000293:Adolescent; D002648:Child; D005859:Germany, East; D006801:Humans; D000297:Psychology, Adolescent; D002666:Psychology, Child; D011998:Recreation
Zur Psychohygiene des Freizeitverhaltens 10-bis 14jähriger Kinder.