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2. Measurement of delinquency in Canada;Akman;J. Crim. Law Criminol.,1968
3. Allgemeine Bevölkerungsumfrage der Sozialwissenschaften ALLBUS 1990;Allerbeck,1990
4. Psychological perspectives on successful aging: the model of selective optimization with compensation;Baltes,1990
5. BBC (2020). What makes Germans so orderly? http://www.bbc.com/travel/story/20200531-what-makes-germans-so-orderly.