@article{Berry2010,
author = {Berry, W.D. and Fording, R.C. and Ringquist, E.J. and Hanson, R.L. and Klarner, C.E.},
title= {Measuring citizen and government ideology in the U.S. states: A re-appraisal},
year = {2010},
doi = {10.1177/153244001001000201},
volume = {10},
number = {2},
pages = {117--135},
}