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- Language: English
- Year: 2008

- Author: Long Roderick T., Machan Tibor R
- Language: English
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- Language: English
- Year: 2010

- Author: Grofman Bernard, Lijphart Arend, Shugart Matthew Soberg, Taylor Steven L
- Language: English
- Year: 2014

- Author: Maloy J. S
- Language: English
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- Author: Feldman David Lewis, Blokov Ivan
- Language: English
- Year: 2012