S. M. Saied, M. Y. Saleh, and A. M. Hamdoon, “Multicomponent Synthesis of Tetrahydrobenzo[a]xanthene and Tetrahydrobenzo[a]acridine Derivatives using Sulfonated Multi-Walled Carbon Nanotubes as Heterogeneous Nanocatalysts”, Iran. J. Catal., vol. 12, no. 2, Jan. 2024, doi: 10.30495/ijc.2022.1955651.1924.