TY  - GEN
A1  - Racioppi, F.
A1  - Rivellini, G.
T1  - The contextual dimension in GGP: Some methodological issues about data collection and sampling procedures
Y1  - 2002
UR  - http://www.unece.org/fileadmin/DAM/pau/_docs/ggp/2003/GGP_2003_IWG002_BgDocCDBWG.pdf

ER  -