E. Szacoń, M. Rządkowska, and D. Matosiuk, “Synthesis of new derivatives of 1-[1-(2-pyridyl)-imidazolidine-2-ylidene]-3-aryl(arylakyl)ureas”, Curr. Issues Pharm. Med. Sci., vol. 25, no. 4, pp. 449–451, Dec. 2012, doi: 10.12923/j.2084-980X/25.4/a.24.