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R. Agarwal, A. H. Rizvi, B. S. Prall, J. D. Olsen, C. N. Hunter, and G. R. Fleming, “The   Nature of Disorder and Inter-complex Energy Transfer in LH2 at Room Temperature:  A  Three Pulse Photon Echo Peak Shift Study,” J. Physica. Chemistry A, 106, 7573 (2002).,