TY  - BOOK
ED  - American Petroleum Institute, API
TI  - Recommended practices for testing high-strenght proppants used in hydraulic fracturing operations: API recommended practice 60
U1  - Caja 12 
PY  - 1995///
CY  - Washington
PB  - American Petroleum Institute, API
KW  - Normalización
KW  - Normas API
ER  -