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Zeitschrift für Psychodrama und Soziometrie > 2017 > 16 > 1 > 7-26
Social Indicators Research > 2009 > 92 > 2 > 295-335
Social Indicators Research > 2007 > 81 > 2 > 181-201
Journal of Economic Growth > 1999 > 4 > 3 > 239-276
Social Indicators Research > 1997 > 41 > 1-3 > 205-228