T. Hamura, Y. Ibusuki, H. Uekusa, T. Matsumoto, J. S. Siegel, K. K. Baldridge, K. Suzuki (2006). Dodecamethoxy- and Hexaoxotricyclobutabenzene: Synthesis and Characterization. Journal of the American Chemical Society 128, 10032–10033.
T. Hamura, Y. Ibusuki, H. Uekusa, T. Matsumoto, J. S. Siegel, K. K. Baldridge, K. Suzuki (2006). Dodecamethoxy- and Hexaoxotricyclobutabenzene: Synthesis and Characterization. Journal of the American Chemical Society 128, 10032–10033.