Violent acts by adolescents in Germany data on the quantitative development and distinctions between different types ; revised version of a paper presented at the European Intensive Seminar "Juvenile Aggression and Delinquency", Fachhochschule Braunschweig/Wolfenbüttel, Fachbereich Sozialwesen, Braunschweig, March 10 - 14, 1997 - Böttger, Andreas 1956- (Kriminologisches Forschungsinstitut Niedersachsen: Forschungsberichte, 1997)