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11570 documents found.
Published:
| Haan, N. de & Breuker, J.
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| Centraal Bureau voor de Statistiek CBS
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| Swierstra, R.
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| Roos, L.
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| Przyborowski, J. & Wilenski, H.
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| -
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| Schumacher, R.O.
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| Festinger, L.