TY  - JOUR 
T1  - Investigation of eighth-grade students' understanding of the slope of the linear function
JO  - Bolema: Boletim de Educação Matemática
A1  - Birgin, Osman
SN  - 0103-636X
UL  - 10.1590/S0103-636X2012000100008
VL  - 26 
Y1  - 2012
PB  - Brasil 
ER  -