TY  - JOUR
A1  - Elwood, S.
A1  - M.J., Goodchild
A1  - Sui, D.
T1  - Researching Volunteered Geographic Information: Spatial data, geographical research, and new social practice
Y1  - 2012
DO  - 10.1080/00045608.2011.595657
JF  - Annals of the Association of American Geographers
VL  - 102
IS  - 3
SP  - 571
EP  - -590

ER  -