TY - GEN
AU - Hanushek, Eric A.
AU - National Bureau of Economic Research
AU - Woessmann, Ludger
TI - Sample Selectivity and the Validity of International Student Achievement Tests in Economic Research
PB - National Bureau of Economic Research
PY - April 2010
BT - NBER working paper series ; no. w15867
CY - Cambridge, Mass
UR - http://slubdd.de/katalog?TN_libero_mab2
ER -
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