TY  - SER
AU  - Trautwein, Ulrich.
TI  - Tracking, grading, and student motivation: using group composition and status to predict self-concept and interest in ninth-grade mathematics 
PY  - 2006///
KW  - Assimilation
KW  - Contrast
KW  - Interest
KW  - Self-concept
KW  - Tracking
N1  - Psychology
ER  -