TY  - RPRT
TI  - Proficiency Analytical Testing (PAT) Program (November 30, 1996).
AU  - C A Esche
AU  - J H Groff
PY  - 1997
DO  - 10.1080/00028894.1997.10399237
UR  - https://pubmed.ncbi.nlm.nih.gov/9075308/
ID  - 9075308
ER  -