@misc{indiciae87572c5f6ca6,
  title = {A rapid and precise method for determining theophylline in serum.},
  author = {C S Frings and R C Keefer and J M Saloom},
  year = {1975},
  doi = {10.3109/15563657508988100},
  url = {https://pubmed.ncbi.nlm.nih.gov/1222528/},
  note = {Source identifier: 1222528}
}