Richardson, C.C. and Kornberg, A. (1964). „A deoxyribonucleic acid phosphatase-exonuclease from Escherichia coli. I. Purification of the enzyme and characterization of the phosphatase activity”. J. Biol. Chem.239: 242-250. PMID14114850.
Richardson, C.C., Lehman, I.R. and Kornberg, A. (1964). „A deoxyribonucleic acid phosphatase-exonuclease from Escherichia coli. II. Characterization of the exonuclease activity”. J. Biol. Chem.239: 251-258. PMID14114851.