K. M. Dridi, R. B. Said, Y. Arfaoui, and A. S. Al-Ayed, “Activated bentonite promoted Friedländer condensation reactions: Synthesis of thieno[2,3-b]quinolinones and tacrines analogues derivatives”, Eur. J. Chem., vol. 4, no. 3, pp. 216–219, Sep. 2013.