C. B. Silva, H. P. M. de Oliveira, and A. O. Ribeiro, “A Microwave Step for the Synthesis of 4,5-Dicyanopyridazine: A Great Forerunner to Phthalocyanines”, Orbital: Electron. J. Chem., vol. 10, no. 2, pp. 153-155, Apr. 2018.