1. Pople JA, Beveridge DL (1970) Approximate molecular orbital theory. McGraw-Hill, New York
2. Schaefer HF (1972) The electronic structure of atoms and molecules. A survey of rigorous quantum mechanical results. Addison-Wesley, Massachusetts
3. Csizmadia IG (1976) Theory and practice of MO calculation on organic molecules. Elsevier, Amsterdam
4. Minkin VI, Simkin BYa, Minyaev RM (1979) Theory of the molecular structure. Vysshaya Shkola, Moscow (in Russian)
5. Zhidomirov GM, Bagaturyants A A, Abronin IA (1979) Applied quantum chemistry. Khimia, Moscow