TY  - BOOK
AU  - French,Gregory T.
TI  - Understanding the GPS: an introduction to the Global Positioning System : what it is and how it works 
SN  - 0965572307
AV  - GA109.5 F74
PY  - 1996///
CY  - Bethesda, Maryland, GeoResearch
KW  - Sistema de Posicionamiento Global
ER  -