1. V. V. Lobanov, I. P. Samchenko, L. I. Fileleeva, and M. M. Aleksankin, ?Molecular positive ions in gas phase. Electronic and geometric structures of HCOOH+, HCOOCH3 +, CH3COOH+, and CH3COOCH3 +,? Int. J. Mass Spectrom. Ion Phys., 42, No. 2, 101?113 (1981).
2. V. V. Lobanov, I. P. Samchenko, L. I. Fileleeva, and M. M. Aleksankin, ?Equilibrium structure of the molecular cation-radical of ethyl acetate in the gas phase. Mechanism of formation of rearrangement ions,? Int. J. Mass Spectrom. Ion Phys., 43, No. 1, 53?62 (1982).
3. J. A. Pople and D. L. Beveridge, Approximate Molecular Orbital Theory, McGraw-Hill, New York (1970).
4. V. V. Lobanov, ?Electronic and spatial structure of the positive and negative molecular ions of acetaldehyde,? Teor. Eksp. Khim., 18, No. 5, 612?617 (1982).
5. L. E. Sutton (editor), Tables of Interatomic Distances and Configuration in Molecules and Ions, Chemical Society, London (1958).