TY  - RPRT
TI  - Proficiency analytical testing (PAT) program.
AU  - C A Esche
AU  - J H Groff
PY  - 1997
DO  - 10.1080/00028894.1997.10399334
UR  - https://pubmed.ncbi.nlm.nih.gov/9291560/
ID  - 9291560
ER  -