Flaks, J.G., Erwin, M.J. and Buchanan, J.M. (1957). „Biosynthesis of the purines. XVI. The synthesis of adenosine 5′-phosphate and 5-amino-4-imidazolecarboxamide ribotide by a nucleotide pyrophosphorylase”. J. Biol. Chem.228: 201-213. PMID13475309.
Kornberg, A., Lieberman, I. and Simms, E.S. (1955). „Enzymatic synthesis of purine nucleotides”. J. Biol. Chem.215: 417-427. PMID14392175.
Lukens, L.N. and Herrington, K.A. (1957). „Enzymic formation of 6-mercaptopurine ribotide”. Biochim. Biophys. Acta24: 432-433. PMID13436452.