@misc{indiciaeb1eff98d5eda,
  title = {Methotrexate impurities.},
  author = {G Tisman and W A Winsten},
  year = {1970},
  doi = {10.1016/s0140-6736(70)91254-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4192131/},
  note = {Source identifier: 4192131}
}