TY  - RPRT
TI  - Standard Reference Materials : Standardization of pH measurements/
AU  - Durst, Richard A
PY  - 1975
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NBS SP 260-53
DO  - 10.6028/NBS.SP.260-53
ER  -