1. A.T. Balaban, I. Motoc, D. Bonchev and O. Mekenyan, Top. Curr. Chem. 21 (1983) 114.
2. A.T. Balaban, Pure Appl. Chem. 55 (1983) 199.
3. A.T. Balaban, Revista de Chimie 39 (1988) 1026.
4. Lecture Notes in Chemistry;A.T. Balaban,1980
5. M.I. Stankevitch, I.V. Stankevitch and N.S. Zefirov, Usp. Khim. 57 (1988) 337.