SYNTHESIS AND SPECTRAL INVESTIGATION OF ANIONIC TETRAKIS-COMPLEXES OF RARE EARTH ELEMENTS WITH DIMETHYL-N-TRICHLORACETYLAMIDOPHOSPHATE AND TETRAPHENYLPHOSPHONIUM CATION: UDC 546.65+535.37. (2018). Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry, 54(2), 43-46. https://chemistry.bulletin.knu.ua/article/view/8453