TY  - RPRT
TI  - Reference methods as a basis for accurate measuring systems.
AU  - J Büttner
PY  - 1991
DO  - 10.1515/cclm.1991.29.4.223
UR  - https://pubmed.ncbi.nlm.nih.gov/1868127/
ID  - 1868127
ER  -