Bryce, M., Moore, A., Tanner, B., Whitehead, R., Clegg, W., Gerson, F., …Pfenninger, S. (1996). Vinylogous Tetrathiafulvalene (ttf) Pi-electron Donors And Derived Radical Cations: Esr Spectroscopic, Magnetic, And X-ray Structural Studies. Chemistry of Materials, 8, 1182-1188