Bell T, Hill N, Mogle J, Sweeder L, Bhargava S. Longitudinal evaluation of perceived stress and memory complaints in the Einstein Aging Study. Anxiety Stress Copin. 2021 Jan;34(1):37-50. doi: 10.1080/10615806.2020.1836621
Parsley (Edwards) TL. Review of the phantom respondents: opinion surveys and political representation. J Off Stat. 1994;10(3):351-5.