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Elsevier‎(2003)‎

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By Snel M.J.   Terwel J.   Aarnoutse C.A.J.   van Leeuwe J.F.J.   in Educational Research and Evaluation

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Routledge Ltd‎(2012)‎

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By Willemsen O.H.   Snel M.M.E.   van Noort S.J.T.   van der Werf K.O.   Grooth B.G.d.G.d.   Figdor C.G.   Greve J.   in Ultramicroscopy

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Elsevier‎(1999)‎

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