Younus, Munisaa, et al. “Exploring the Diastereoselectivity for Fischer Indolization of L-Menthone under Different Conditions, Spectral Characterization, and Biological Activities of New (2R,4aS)-2,3,4,4a-Tetrahydro-1H-Carbazole Analogs”. European Journal of Chemistry, vol. 13, no. 3, Sept. 2022, pp. 293-8, doi:10.5155/eurjchem.13.3.293-298.2266.