TY  - BOOK
AU  - Neteler,Markus
AU  - Mitasova,Helena
TI  - Open source GIS:a GRASS  GIS approach
SN  - 9780387357676
U1  - 911:681.516 
PY  - 2008///
CY  - New York
PB  - Springer
KW  - Geographic information systems
KW  - GRASS(Electronic computer system)
KW  - Open source software
ER  -