%0 Journal Article %A Mei-Chu Chang %T On sum-product representations in $\Bbb Z_q$ %J Journal of the European Mathematical Society %D 2006 %P 435-463 %V 8 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/62/ %R 10.4171/jems/62 %F JEMS_2006_8_3_a1