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9Ralph M. Kramer, A Third Sector in the Third Millennium? International Journal of Voluntary and Nonprofit Organizations, Vol. 11, No. 1, 2000.
10Lester M Salamon and Helmut K. Anheier Social Origins of Civil Society: Explaining the Nonprofit Sector Cross -Nationally. International Journal of Voluntary and Nonprofit Organizations, Vol. 9, No. 3, 1998.