@article{Warren2012,
author = {Warren, J.R.  and Halpern-Manners, A.},
title= {Panel conditioning in longitudinal social science surveys},
year = {2012},
doi = {10.1177/0049124112460374},
journal = {Sociological Methods & Research},
volume = {41},
number = {4},
pages = {491--534},
}