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Published:
| Bongard, A.E. & Winterfeld, U.
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| Steenstra, A.J.
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| Junger-Tas, J. & Zee-Nefkens, A. van de
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| Tielemans, P.
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| Robert, J. & Brabanter, R. de
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| Ludvigsen, K. (ed.)