Helmke, K./Levitsky, S. (2004) Informal institutions and comparative poli- tics: a research agenda, in: Perspectives on Politics 2, 725-740. International Crisis Group (2011). North Kosovo: Dual Sovereignity in Practice. Europe Report No 204, ICG, Brussels/Pristina.
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Helmke, K. L., S. (2004). Informal institutions and comparative poli- tics: a research agenda. International Crisis Group. Perspectives on Politics, 2 pp. 725-740.
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