Key points are not available for this paper at this time.
John H. Aldrich, Richard G. Niemi, George Rabinowitz, David W. Rohde, The Measurement of Public Opinion about Public Policy: A Report on Some New Issue Question Formats, American Journal of Political Science, Vol. 26, No. 2 (May, 1982), pp. 391-414
Aldrich et al. (Sat,) studied this question.