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              Asseburg, R., & Frey, A. (2013). Too hard, too easy, or just right? The relationship between effort or boredom and ability- difficulty fit. Psychological Test and Assessment Modeling, 55(1), 92-104.
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              Asseburg, R., & Frey, A. (2013). Too hard, too easy, or just right? The relationship between effort or boredom and ability-difficulty fit. Psychological Test and Assessment Modeling, 55, 92-104.
                 (xsd:string)
              
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        | ?:name | 
            
              Asseburg, R., Frey, A. (2013). Too hard, too easy, or just right? The relationship between effort or boredom and ability- difficulty fit. Psychological Test and Assessment Modeling, 55(1), pp. 92-104.
                 (xsd:string)
              
             |