F C Grozema, R Telesca, H T Jonkman, L D A Siebbeles, J G Snijders, Excited state polarizabilities of conjugated molecules calculated using time dependent density functional theory, JCP 115, 10014 (2001)
S Tretiak, V Chernyak, S Mukamel, Origin, scaling, and saturation of second order polarizabilities in donor/acceptor polyenes, CPL 287, 75 (1998)