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1Article in monograph or in proceedings bibliotecaWUR NL
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2Doctoral thesis bibliotecaWUR NL
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3Article/Letter to editor bibliotecaWUR NL
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4Article/Letter to editor bibliotecaWUR NL
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5Article/Letter to editor bibliotecaWUR NL
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6by SLO Invitational Conference, Leiden, Netherlands, 2005, Netherlands Institute for Curriculum Development, Letschert, J.F.M.book bibliotecaUNESCO
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7by Kraan, M., Bitetto, I., Bellanger, M., Brown, E., Depestele, J., Frangoudes, K., Hamon, K., Hegland, T., Lehuta, S., Letschert, J., Liontakis, A., Mendo, T., Muench, A., Northridge, S., Pecceu, E., Spedicato, M.T., Stelzenmüller, V., Sys, K., Rindorf, A.External research report bibliotecaWUR NL