Shirini, Farhad, et al. “1,3-Dibromo-5,5-Dimethylhydantoin (DBH) As a Cheap and Efficient Catalyst for the Synthesis of Polyhydroquinolines and 12-Aryl-8,9,10,12-Tetrahydro [a] Xanthene-11-Ones”. Iranian Journal of Catalysis, vol. 3, no. 2, Feb. 2024, https://oiccpress.com/ijc/article/view/3755.