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Accelerating mathematics achievement using heterogenous gro..:

Burris, Carol C ; Heubert, Jay P
American educational research journal.  43 (2006)  1 - p. 105-136 , 2006
Link: https://doi.org/10.3102/00028312043001105
Exemplar:  Zentrale:E03 z pae 001 jc/277; Zentrale:Magazin Zs fc 5277