@article{Groves2006,
author = {Groves, R.M. and Couper, M.P. and Presser, S. and Singer, E. and Tourangeau, R. and Acosta, G.P. and Nelson, L.},
title= {Experiments in producing nonresponse bias},
year = {2006},
doi = {10.1093/poq/nfl036},
journal = {Public Opinion Quarterly},
volume = {70},
number = {5},
pages = {720−736},
}