J. Zhang, X. Liang, Y. Jiang, G. Wang, C. Qu, and B. Zhao, “Computational Study on the Second-Order Nonlinear Optical Properties of Coumarin Derivatives with N-p-Vinylphenyl Carbazole Chromophores”, ajc, vol. 26, no. 21, pp. 7404–7408, Oct. 2014.