Brendel, C., Dias, F., Saragi, T., Monkman, A., & Salbeck, J. (2009). Photophysical properties of the asymmetrically substituted spirobifluorenes spiro-DPO and spiro-MeO-DPO. physica status solidi (a) – applications and materials science, 206(12), 2715-2722. https://doi.org/10.1002/pssa.200925302