@misc{indiciaeb98138176748,
  title = {Simplified micro-scale procedure for preparing samples for theophylline determination by liquid chromatography.},
  author = {J W Nelson and A L Cordry and C G Aron and R A Bartell},
  year = {1977},
  url = {https://pubmed.ncbi.nlm.nih.gov/832360/},
  note = {Source identifier: 832360}
}