@misc{indiciaee6add2f2e985,
  title = {Solution to quality assurance challenge 4.},
  author = {Manfred Reichenbächer and Jürgen W Einax},
  year = {2007},
  doi = {10.1007/s00216-006-1060-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/17226003/},
  note = {Source identifier: 17226003}
}