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\bibitem{Howard_etal2004} {\textquotedblleft}\textit{Approaches to calculation of exciton interaction energies for a molecular dimer}{\textquotedblright}. Howard IA, Zutterman F, Deroover G, Lamoen D, van Alsenoy C, Journal Of Physical Chemistry B \textbf{108}, 19155 (2004).   http://doi.org/10.1021/jp040417h

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