1. G. G. Dyadyusha and V. I. Lutoshkin, Teor. i Éksperim. Khim., 7, 3 (1971).
2. V. I. Lutoshkin, G. G. Dyadyusha, and Yu. A. Kruglyak, in: Structure of Molecules and Quantum Chemistry [in Russian], Naukova Dumka, Kiev (1970), p. 132.
3. G. G. Dyadyusha and V. I. Lutoshkin, Lit. Fiz. Sbornik, 11 (1971).
4. L. Salem, The Molecular Orbital Theory of Conjugated Systems, W. A.Benjamin (1966).
5. G. G. Dyadyusha, and V. A. Kuprievich, Teor. i Éksperim. Khim., 1, 406 (1965).