“PHASES ON THE BASIS OF THE CETYLPYRIDINIUM CHLORIDE FOR PRECONCENTRATION PURPOSES: UDC 543.2, 542.61, 611.185.1”. 2010. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry 48 (1): 7-9. https://chemistry.bulletin.knu.ua/article/view/8301.