Pindur, U., & Kim, M.-H. (1990). Nevv Reactions of Vinylindoles as Heterocyclic Dienes with 4-Phenyl-1,2,4-triazoline-3,5-dione: Non-Concerted versus Concerted Processes. CHIMIA, 44(10), 339. https://doi.org/10.2533/chimia.1990.339