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Group assessment of learning potential of pupils in mainstream primary education and special education classes Hessels, Marco G.P.; Berger, Jean-Louis; Bosson, Mélanie 2008
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Performance of Adolescents with Moderate Mental Retardation on a Working Memory Task and Analysis of their Response Patterns Hessels, Marco G.P. 2002
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The measurement of mental attentional capacity: a neo-Piagetian developmental study Pennings, Albèr H.; Hessels, Marco G.P. 1996