1. General atomic and molecular electronic structure system
2. ACES II is a program product of the Quantum Theory Project, University of Florida. Authors: J.F. Stanton, J. Gauss, J.D. Watts, M. Nooijen, N. Oliphant, S.A. Perera, P.G. Szalay, W.J. Lauderdale, S.R. Gwaltney, S. Beck, A. Balkova, D.E. Bernholdt, K.-K. Baeck, P. Rozyczko, H. Sekino, C. Huber and R.J. Bartlett.
3. The Cambridge Analytic Derivatives Package Issue 6, Cambridge, 1995. A suite of quantum chemistry programs developed by R.D. Amos with contributions from I.L. Alberts, J.S. Andrews, S.M. Colwell, N.C. Handy, D. Jayatilaka, P.J. Knowles, R. Kobayashi, K.E. Laidig, G. Laming, A.M. Lee, P.E. Maslen, C.W. Murray, J.E. Rice, E.D. Simandiras, A.J. Stone, M.-D. Su and D.J. Tozer.
4. Dalton, a molecular electronic structure program, Release 1.2 (2001), written by T. Helgaker, H.J.Aa. Jensen, P. Jørgensen, J. Olsen, K. Ruud, H. Agren, A.A. Auer, K.L. Bak, V. Bakken, O. Christiansen, S. Coriani, P. Dahle, E.K. Dalskov, T. Enevoldsen, B. Fernandez, C. Hättig, K. Hald, A. Halkier, H. Heiberg, H. Hettema, D. Jonsson, S. Kirpekar, R. Kobayashi, H. Koch, K.V. Mikkelsen, P. Norman, M.J. Packer, T.B. Pedersen, T.A. Ruden, A. Sanchez, T. Saue, S.P.A. Sauer, B. Schimmelpfennig, K.O. Sylvester-Hvid, P.R. Taylor and O. Vahtras.
5. M.F. Guest, J.M.H. Thomas, P. Sherwood, I.J. Bush, H.J.J. van Dam, J.H. van Lenthe, R.W.A. Havenith and J. Kendrick, Mol. Phys, in press.