N. R. Kestner; O. Sinanoglu (1962). "Study of Electron Correlation in Helium-Like Systems Using an Exactly Soluble Model". Phys. Rev. 128 (6): 2687–2692. Bibcode:1962PhRv..128.2687K. doi:10.1103/PhysRev.128.2687.
S. Kais; D. R. Herschbach; N. C. Handy; C. W. Murray; G. J. Laming (1993). "Density functionals and dimensional renormalization for an exactly solvable model". J. Chem. Phys. 99 (1): 417–425. Bibcode:1993JChPh..99..417K. doi:10.1063/1.465765.
N. R. Kestner; O. Sinanoglu (1962). "Study of Electron Correlation in Helium-Like Systems Using an Exactly Soluble Model". Phys. Rev. 128 (6): 2687–2692. Bibcode:1962PhRv..128.2687K. doi:10.1103/PhysRev.128.2687.
S. Kais; D. R. Herschbach; N. C. Handy; C. W. Murray; G. J. Laming (1993). "Density functionals and dimensional renormalization for an exactly solvable model". J. Chem. Phys. 99 (1): 417–425. Bibcode:1993JChPh..99..417K. doi:10.1063/1.465765.