Alimzhanova, Mereke, Yerlan Adilbekov, Yenglik Nurzhanova, and Svetlana Batyrbekova. 2016. “Determination of Ethinylestradiol and Norgestrel in Water Using Solid-Phase Microextraction”. Chemical Bulletin of Kazakh National University 83 (3-4), 52-62. https://doi.org/https://doi.org/10.15328/cb700.