TY  - JOUR
TI  - Including “Don't know” answer options in brand image surveys improves data quality.
DO  - http://dx.doi.org/10.2501/IJMR-2013-043
SP  - 33
EP  - 50
PY  - 2014-01-01
JO  - International Journal of Market Research (früher: Journal of the Market Research Society)
AU  - Dolnicar, Sara 
AU  - Grün, Bettina 
ER -