B. Ágai, K. Lempert, and G. Hornyák, “CONDENSED 1,3,5-TRIAZEPINES - V THE SYNTHESIS OF PYRAZOLO [1,5-a] [1,3,5]-BENZOTRIAZEPINES ”, Period. Polytech. Chem. Eng., vol. 26, no. 3-4, pp. 221–228, Jan. 1982.