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| 100 | 1 | _aZheng, Fen | |
| 245 | 0 | 0 | _aThe Model of stratificational structure of patent information retrieval language |
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_aChina _9615 |
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_aPatentdokumentation _93575 |
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_aWPI. 11(1989),2,76-82. _wz_WPI |
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