1. Kolos N.N., Nikishin D.I., Chechina N.V., Zamigaylo L.L. Synthesis of pyrimidine-2,4,6-trion and 2-thioxo-pyrimidin-4,6-dione with imidazolidine fragment // Kharkiv University Bulletin. Chemical Series. 2013. № 22. C. 45-52.