@misc{indiciae87ce52730404,
  title = {Enzyme standardisation--reference methods or official methods?},
  author = {R Spitzer and L Ewen},
  year = {1973},
  doi = {10.1016/s0009-9120(73)80013-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4728964/},
  note = {Source identifier: 4728964}
}