TY  - RPRT
TI  - Energy measurement in the standard penetration test 
AU  - Kovacs, William D
AU  - salamone, Lawrence A
AU  - Yokel, Felix Y
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS BSS 135
DO  - 10.6028/NBS.BSS.135
ER  -