Hou, Dekun, Otgonbayar Khureldavaa, Fujin Zhang, Jiang He, and Badgaa Amarsanaa. 2019. “Determination of OCPs and PCBs in Environmental Water Samples by GC-DLLME Optimized by Response Surface Methodology”. Mongolian Journal of Chemistry 20 (46):13-23. https://doi.org/10.5564/mjc.v20i46.1237.