Keal-Tozer functionals

The KT3 Keal-Tozer) functional has been constructed as a combination of LDA and OPTX exchange combined with the LYP correlation functional, and modified with an additional gradient term, all multiplied with fitting coefficients, as shown in eq. (6.43)." ... 

Peach MJG, Helgaker T, Salek P, Keal TW, Lutneas OP, Tozer DJ, Handy NC (2006) Assessment of a coulomb-attenuated exchange-corelation eneigy functional. Phys Chem Chem Phys 5 558-562... 

T.W. Keal, T. Helgaker, P. Salek, D. Tozer, Choice of exchange-correlation functional for computing NMR indirect spin-spin couphng constants, J. Chem. Phys. Lett. 425 (2006) 163. 

Peach, M. J. G., Helgaker, T., Satek, R, Keal, T. W., Lutnaes, O. B., Tozer, D. J. Handy, N. C. (2006). Assessment of a coulomb-attenuated exchange-correlation energy functional, Phys. Chem. Chem. Phys. 8 558. 

Keal, T.W. and Tozer, D.J. (2005) Semiempirical hybrid functional with improved performance in an extensive chemical assessment. /. Chem. Phys., 123, 121103. 

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