TY  - JOUR
T1  - No Opinion or Not Sure?
AU  - Duncan, Otis Dudley
AU  - Stenbeck, Magnus
PY  - 1988
DO  - 10.1086/269127
SP  - 513
EP  - 525
JO  - Public Opinion Quarterly
VL  - 52
IS  - 4
SN  - 0033-362X
ER  -