1. Bulut I., Bulut I., Bicer E., Cakir O.: J. Coord. Chem. 56, 511 (2003)
2. Roy M.N., Sinha B., Sarkar B.K.: J. Chem. Thermodyn. 40, 394 (2008)
3. Robinson F.A.: The Vitamin B-Complexes, Chap 4. Chapman & Hall, London (1951)
4. Nesmeyanov A.N., Nesmeyanov N.A.: Fundamentals of Organic Chemistry, vol. 3, pp. 393. Mir, Moscow (1981)
5. Fauci A.S., Braunwald E., Isselbacher K.J., Wilson J.D., Martin J.B., Kasper D.L., Hauser S.L., Long D.L.: Harrison’s Principles of Internal Medicine, 14th edn. McGraw-Hill, New York (1998)