Nucleus-Independent Chemical Shifts (NICS) as an Aromaticity Criterion, Zhongfang Chen,*† Chaitanya S. Wannere,† Clémence Corminboeuf,† Ralph Puchta,‡ and Paul von Ragué Schleyer*†, Chem. Rev., 2005, 105 (10), pp 3842–3888
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http://pubs.acs.org/doi/pdf/10.1021/cr030088%2B