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Gieseking, R. ., Ensley, T. ., Hu, H. ., Hagan, D. ., Risko, C. ., Van Stryland, E. ., & Brédas, J. . (2015). Nonlinear Optical Properties of X(C6H5)4 (X = B(-), C, N(+), P(+)): A New Class of Molecules with a Negative Third-Order Polarizability. Journal of the American Chemical Society, 137(30), 9635-42. https://doi.org/10.1021/jacs.5b04377 (Original work published 2015)