Rumi, M.; Ehrlich, J.E.; Heikal, A.A.; Perry, J.W.; Barlow, S.; Hu, Z.; McCord-Maughon, D.; Parker, T.C.; Röckel, H.; Thayumanavan, S.; Marder, S.R.; Beljonne, D.; Brédas, J.L. “Structure-Property Relationships for Two-Photon Absorbing Chromophores: Bis-Donor Diphenylpolyene and Bis(styryl)benzene Derivatives” J. Am. Chem. Soc. 2000, 122, 9500-9510. (DOI: 10.1021/ja994497s)