TY  - RPRT
TI  - Enzyme standardisation--reference methods or official methods?
AU  - R Spitzer
AU  - L Ewen
PY  - 1973
DO  - 10.1016/s0009-9120(73)80013-x
UR  - https://pubmed.ncbi.nlm.nih.gov/4728964/
ID  - 4728964
ER  -