Perepichka, D., Bryce, M., Perepichka, I., Lyubchik, S., Christensen, C., Godbert, N., …Zhao, J. (2002). A (π-extended tetrathiafulvalene)-fluorene conjugate. Unusual electrochemistry and charge transfer properties: The first observation of a covalent D²⁺–σ–A˙⁻ redox state. Journal of the American Chemical Society, 124(47), 14227-14238. https://doi.org/10.1021/ja012518o