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ncbi.nlm.nih.gov
PARKER, William B.. Enzymology of Purine and Pyrimidine Antimetabolites Used in the Treatment of Cancer. Chem Rev, 2009, s. 2880–2893. DOI: 10.1021/cr900028p. PMID 19476376.
Purine Analogues. Bethesda (MD) : National Institute of Diabetes and Digestive and Kidney Diseases, 2012. PMID: 31643909. Dostupné online.