TY  - RPRT
TI  - Methotrexate impurities.
AU  - G Tisman
AU  - W A Winsten
PY  - 1970
DO  - 10.1016/s0140-6736(70)91254-7
UR  - https://pubmed.ncbi.nlm.nih.gov/4192131/
ID  - 4192131
ER  -