@techreport{Festy2002,
author = {Festy, P.},
title= {From GGS to GGP; from micro- to macro- via meso- levels. Variables in the survey [GGS] and in the contextual database [CDB]},
year = {2002},
URL = {http://www.unece.org/fileadmin/DAM/pau/_docs/ggp/2003/GGP_2003_IWG002_BgDocCDBWG.pdf},
}