1. A new method for large-scale Cl calculations
2. Siegbahn, P.E.M. 1975.Proceedings of SRC Atlas Symposium Number4,Quantum Chemistry : The State of the Art, Edited by: Saunders, V.R. and Brown, J. 81–81. Chilton, Didcot, Oxfordshire: Rutherford Laboratory.Pakiari, A. H., andHandy, N. C., 1975,Theor. chim. Acta,40,17.Roos, B. O., andSiegbahn, P. E. M., 1977,Modern Theoretical Chemistry, Vol. 3, edited by H. F. Schaefer (Plenum), Chap. 7.Roos, B. O., andSiegbahn, P. E. M., 1977,J. Am. chem. Soc.,99,7716.Lucchese, R. R., andSchaefer, H. F., 1978,J. chem. Phys.,68,769.Roos, B. O., andSiegbahn, P. E. M., 1979,J. chem. Phys.,70,5391.Handy, N. C.Goddard, J. D., andSchaefer, H. F., 1979,J. chem. Phys.,71,426.Roos, B. O., andSiegbahn, P. E. M., 1980,Int. J. quant. Chem.,17,485.
3. Generalizations of the direct CI method based on the graphical unitary group approach. II. Single and double replacements from any set of reference configurations
4. Theory of self‐consistent electron pairs. An iterative method for correlated many‐electron wavefunctions
5. Direct determination of pair natural orbitals