TY  - GEN
AU  -  Bernhardsen, Tor
TI  - Geographic information systems: an introduction 
SN  - 9788126511389
PY  - 2011///
CY  - New Delhi
PB  - Wiley
KW  - GIS - Geographic information systems
KW  - Geospatial infrastructure
KW  - Georeferencing systems
ER  -