1. Blakley, R.L, Cobalamin-Dependent Ribonucleotide Reductases, in B 12 (two volums), Dolphin, D., Ed., New York: Wiley, 1982.
2. Harder, J., Ribonucleotide Reductases and Their Occurrence in Microorganisms: a Link to the RNA/DNA Transition, FEMS Microbiol. Rev., 1993, vol. 12, pp. 273–292.
3. Reichard, P., From RNA To DNA, Why So Many Ribonucleotide Reductases?, Science, 1993, vol. 260, no. 5115, pp. 1773–1777.
4. Poole, A.M., Logan, D.T., and Sjöberg, B.-M., The Evolution of the Ribonucleotide Reductases: Much Ado About Oxygen, J. Mol. Evol., 2002, vol. 55, pp. 180–196.
5. Ryzhkova (Jordan) E.P. Multiple Functions of Corrinoids in Prokaryote Biology, Prikl. biokhim. Mikrobiol., 2003, vol. 39, no. 2, pp. 133–159 [Appl. Biochem. Microbiol. (Engl. Transl.), vol. 39, no. 2, pp 115–139].