“HOLLOW FIBER LIQUID MICROEXTRACTION FOR PRECONCENTRATION OF BENZOPHENONE: UDC 543. 544; 547.594”. Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, vol. 49, no. 1, Nov. 2013, pp. 43-45, https://chemistry.bulletin.knu.ua/en/article/view/8456.