%0 Journal Article
%T Probing 'Don't Know' Answers: Effects on Survey Estimates and Variable Relationships
%A Sanchez, Maria Elena
%A Morchio, Giovanna
%D 1992
%R 10.1086/269337
%P 454-474
%J Public Opinion Quarterly
%V 56
%I 4
%2 ISSN: 0033-362X