Boitsov, V.M., et al. “Facile One-Pot Synthesis of Benzo[h]isoquinolines via Strong Acid Triggered [1,2]-Sigmatropic Rearrangement: A Theoretical and Experimental Studies”. Asian Journal of Chemistry, vol. 31, no. 9, July 2019, pp. 2133-8, doi:10.14233/ajchem.2019.22074.