There is a short subchapter in Leach's Molecular modeling (chapter 4), Using charge schemes to study aromatic-aromatic interactions. Maybe you get your hands on the book. It refers to Hunter and Sanders 1990 article: http://pubs.acs.org/doi/abs/10.1021/ja00170a016 There are more than 1000 articles citing the above one. Skim through and maybe your formula is in one of them.
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