1.
Schonlau M, van Soest A, Kapteyn A. Are `Webographic’ or attitudinal questions useful for adjusting estimates from Web surveys using propensity scoring?. SRM [Internet]. 2007 Dec. 31 [cited 2024 Jun. 22];1(3):155-63. Available from: https://ojs.ub.uni-konstanz.de/srm/article/view/70