1. K. Raghavachari and L. A. Curtiss, in Modern Electronic Structure Theory, D. R. Yarkony, Ed. (World Scientific, Singapore, 1994), and references therein.
2. L. A. Curtiss and K. Raghavachari, in Quantum Mechanical Electronic Structure Calculations with Chemical Accuracy, S. R. Langhoff, Ed. (Kluwer Academic Publishers, Netherlands, 1994), and references therein.
3. C. W. Bauschlicher and S. R. Langhoff, Science 254, 394 (1991).
4. Chem. Rev. 86 (1986), Special Issue on Gas Phase Clusters.
5. Atomic and molecular clusters, E. R. Bernstein, Ed. (Elsevier, Amsterdam, 1990).