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- Language: English
- Year: 2005
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- Language: English
- Year: 2007
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- Language: English
- Year: 2014
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- Language: English
- Year: 2012
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- Language: English
- Year: 2009
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- Language: English
- Year: 2003
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- Language: English
- Year: 2007
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- Language: English
- Year: 2016
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- Language: English
- Year: 2017
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- Author: Andreescu Titu, Savchev Svetoslav
- Language: English
- Year: 2003