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The effects of class size: An examination of rival hypothes..:

Hedges, Larry V ; Stock, William
American educational research journal.  20 (1983)  1 - p. 63-85 , 1983
Link: https://doi.org/10.3102/00028312020001063
Exemplar:  Zentrale:E03 z pae 001 jc/277; Zentrale:Magazin Zs fc 5277