Author

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Robert Rettinger
FernUniversität Hagen
Hagen, Germany
3 articles by this author
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Research Article
 Unique: 393 | Total: 453  | Access Period:
 1301-1316
Editorial
 28-03-2009
 Unique: 326 | Total: 372  | Access Period:
 1143-1144
Research Article
 Unique: 289 | Total: 324  | Access Period:
 896-907

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