TY  - RPRT
TI  - Development of thin calibration standards for x-ray fluorescence analysis 
AU  - Pella, P A
AU  - Kuehner, E C
AU  - Cassatt, W A
PY  - 1976
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 75-970
DO  - 10.6028/NBS.IR.75-970
ER  -