TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Subsurface barrier valves and related equipment: API Specification 19V
U1  - Caja 11 
PY  - 2013///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normalización
KW  - Normas API
N1  - ISO 28781: 2010 (Modified), petroleum and natural gas industries- Drilling and production equipment- subsurface barrier valves and related equipment
ER  -