Journal of Molecular Graphics and Modelling
Volume 27, Issue 8, June-July 2009, Pages 853-859
Computed NMR shielding increments over unsaturated five-membered ring heterocyclic compounds as a measure of aromaticity
Ned H. Martin, Jimmy E. Rowea and Eddie LaReece Pittmana
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http://dx.doi.org/10.1016/j.jmgm.2009.01.002спасибо