[Cramped like in a sardine box].
Staub
Angelika
A
D000533:Altruism; D002648:Child; D002652:Child Behavior; D004493:Education / Q000379:methods*; D005858:Germany; D006379:Helping Behavior; D006801:Humans; D012574:Schools / Q000639:trends*; D012919:Social Behavior