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A1 El-Kolli, Larbi. ID 23877 OP pp. 113-123 T1 How far has “Time - Spent - on - the - Task" by pupils and teachers proved to be crucial variable in classroom research? [Article] UL 1 http://search.shamaa.org/fulltext.gif http://revue.umc.edu.dz/index.php/h/article/download/799/907 Full text (PDF)