@article{Winter2011,
author = "Winter, T. and Lauwereys, G. and Vanderbeken, H. and Dewaleffe, S. and Pasteels, I. and Neels, K.",
title = "GGS wave 1 Belgium: fieldwork",
year = 2011,
journal = "GGP Belgium papers series",
volume = 2,
pages = "50",
url = "http://www.ggps.be/doc/GGP_Belgium_Paper_Series_2.pdf"
}