Khorshidi, A., S. Shariati, and M. Abootalebi. “Synthesis of Bis- and tris(indolyl)methanes Catalyzed by an Inorganic Nano-Sized Catalyst Followed by Dehydrogenation to Hyperconjugated Products”. Journal of the Serbian Chemical Society, vol. 81, no. 9, Oct. 2016, pp. 1069-7, doi:10.2298/JSC160207052K.