1. P.W. Atkins, Molecular Quantum Mechanics, 2nd edn., New York, 1983.
2. A. Szabo, N.S. Ostlund, Modern Quantum Chemistry: Introduction to Advanced Electronic Structure Theory, New York, 1982.
3. J. Sadlej, Semi-Empirical Methods of Quantum Chemistry, New York, 1985.
4. Equipotential surfaces of the model reaction H+H2: Struggling with three dimensions
5. Excited electronic potential-energy surfaces and transition moments for theH3system