N. C. Handy and H. F. Schaefer III, “On the evaluation of analytic energy derivatives for correlated wave-functions,” J. Chem. Phys., 81 (1984) 5031-33. DOI: 10.1063/1.447489
N. C. Handy and H. F. Schaefer III, “On the evaluation of analytic energy derivatives for correlated wave-functions,” J. Chem. Phys., 81 (1984) 5031-33. DOI: 10.1063/1.447489