Paper pres. in a symposium on Developmental Psychology organized by the Finnish Psychological Society, the Psychological Society of the German Democratic Republic, and the Department of Psychology, University of Jyväskylä. January 27-29, 1982, University of Jyväskylä.
Paper presented in a symposium on Developmental Psychology organized by the Finnish Psychological Society, the Psychological Society of the German Democratic Republic, and the Department of Psychology, University of Jyväskylä. January 27-29, 1982, University of Jyväskylä.