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- Language: English
- Year: 1999
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- Language: English
- Year: 2003
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- Author: Tomescu Ioan
- Language: English
- Year: 1985
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- Language: English
- Year: 2017
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- Author: Hansen P. (ed.)
- Language: English
- Year: 1981
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- Language: English
- Year: 2015
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- Author: Alexandru T. Balaban
- Language: English
- Year: 1976