Hakobyan, G.V. et al. 2005. INTERACTIONS OF METHYLOL DERIVATIVES OF UREA WITH Co(II) AND Ni(II) SALTS. Proceedings of the YSU B: Chemical and Biological Sciences. 39, 2 (207) (Jun. 2005), 66–70. DOI:https://doi.org/10.46991/PYSU:B/2005.39.2.066.