1. See articles by Beck and Nicolaides in “Excited States in Quantum Chemistry” eds. C.A. Nicolaides and D.R. Beck, Reidei (1978)
2. C.A. Nicolaides in “Advanced Theories and Computational Approaches to the Electronic Structure of Molecules” ed. C.E. Dykstra, Reidel (1984), p.161
3. C.A. Nicolaides, Chem.Phys.Lett. 101, 435 (1983)
4. Y. Komninos and C.A. Nicolaides, Phys.Rev. A33 (1986)
5. Y. Komninos and C.A. Nicolaides, J.Phys. B19, 1701 (1986)