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Performance of the DFTB method in comparison to DFT and semiempirical methods for geometries and energies of C20–C86 fullerene isomers
Zheng, G. and Irle, S. and Morokuma, K.
Chemical Physics Letters
Volume 412, Issues 1-3, 25 August 2005, Pages 210-216
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http://dx.doi.org/10.1016/j.cplett.2005.06.105Stefan Portmann, John M. Galbraith, Henry F. Schaefer, Gustavo E. Scuseria, Hans Peter Lüthi
Chemical Physics Letters, Volume 301, Issues 1-2, 19 February 1999, Pages 98-104
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http://dx.doi.org/10.1016/S0009-2614(98)01435-3