TY  - SER
AU  - Quinlan,Martin
TI  - The North Sea shows its age
PY  - 2011///
CY  - 
PB  - 
N2  - Transcripción del resumen del autor. The four-country North Sea area is showing increasing signs of maturity, with oil output declining, discoveries becoming smaller – and, most worryingly, exploration activity falling, Martin Quinlan writes
ER  -