Ii. Guseinov et Rf. Yassen, UNIFIED TREATMENT OF 2-CENTER COULOMB, HYBRID, AND EXCHANGE INTEGRALSOVER SLATER-TYPE ORBITALS, International journal of quantum chemistry, 54(4), 1995, pp. 197-199
Using Neumann expansion for 1/r(12) in elliptical coordinates a combin
ed formula has been obtained for two-center Coulomb, hybrid, and excha
nge integrals with Slater-type orbitals. (C) 1995 John Wiley & Sons, I
nc.