Osamura82

Y. Osamura, Y. Yamaguchi, and H. F. Schaefer III, “Generalization of analytic configuration-interaction (CI) gradient techniques for potential-energy hypersurfaces, including a solution to the coupled perturbed Hartree-Fock equations for multiconfiguration SCF molecular wave-functions,” J. Chem. Phys., 77 (1982) 383-90. DOI: 10.1063/1.443617