Author

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R. Bartel
7 articles by this author
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Research Article
 Unique: 241 | Total: 294  | Access Period:
 49-58
Research Article
 Unique: 289 | Total: 342  | Access Period:
 65-85
Research Article
 Unique: 263 | Total: 311  | Access Period:
 51-63
Research Article
 Unique: 356 | Total: 417  | Access Period:
 3-20

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