@article{Lauwereys2011,
author = "Lauwereys, G. and Neels, K. and De Winter, T.",
title = "Wave 1 Response rate calculation.",
year = 2011,
journal = "GGP Belgium papers series",
volume = 3,
pages = "64",
url = "http://www.ggps.be/doc/GGP_Belgium_Paper_Series_3.pdf"
}