Burant96a

J. C. Burant, M. C. Strain, G. E. Scuseria, and M. J. Frisch, “Analytic Energy Gradients for the Gaussian Very Fast Multipole Method (GvFMM),” Chem. Phys. Lett., 248 (1996) 43-49. DOI: 10.1016/0009-2614(95)01301-6