1. A complete active space SCF method (CASSCF) using a density matrix formulated super-CI approach
2. K. Ruedenberg and K. R. Sundberg, in Quantum Science, edited by J.L. Calais, O. Goscinski, J. Linderberg, and Y. Ohrn (Plenum, New York, 1976), pp. 505–515.
3. MOLCAS 7: The Next Generation
4. A perspective on the CASPT2 method
5. W. J. Hehre, L. Radom, P. V. R. Schleyer, and J. A. Pople, Ab Initio Molecular Orbital Theory (Wiley, New York, 1986), p. 5.