@misc{indiciae33413772c6cf,
  title = {Primary reference materials for chemical composition analysis - Proposal for an operational definition.},
  author = {W Hässelbarth},
  year = {1996},
  doi = {10.1007/s0021663540263},
  url = {https://pubmed.ncbi.nlm.nih.gov/15048445/},
  note = {Source identifier: 15048445}
}