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2. Estimating correlation energy and basis set error for Hartree–Fock-SCF calculation by scaling during the SCF subroutine with inserting only a few program lines, using analytical integration and no extra CPU time and no extra disc space
3. W. Koch, M.C. Holthausen: A Chemist's Guide to Density Func. Theory, 2001, 2nd Ed., Wiley-VCH Verlag GmbH
4. A. Szabo, N.S. Ostlund: Modern Quant. Chem.: Intro. Adv. Electr. Struct. Theory, 1982, McMillan, NY.
5. R.G. Parr, W. Yang: Density - Functional Theory of Atoms and Molecules, 1989, Oxford University Press, New York