1. Wang, Z.; Dai, S.; Zou, J., et al. Rare earth elements and yttrium in coal ash from the Luzhou power plant in Sichuan, Southwest China: Concentration, characterization and optimized extraction. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2019, 203: 1-14.

2. Guo, W.; Dai, S.; Nechaev, V. P., et al. Geochemistry of Palaeogene coals from the Fuqiang Mine, Hunchun Coalfield, northeastern China: Composition, provenance, and relation to the adjacent polymetallic deposits. JOURNAL OF GEOCHEMICAL EXPLORATION, 2019, 196: 192-207.

3. Fu, B.; Hower, J. C.; Dai, S., et al. Determination of Chemical Speciation of Arsenic and Selenium in High-As Coal Combustion Ash by X-ray Photoelectron Spectroscopy: Examples from a Kentucky Stoker Ash. ACS OMEGA, 2018, 3 (12): 17637-17645.

4. Dai, S.; Hower, J. C.; Ward, C. R., et al. Enrichment of Bi-Be-Mo-Cd-Pb-Nb-Ga, REEs and Y in the Permian coals of the Huainan Coalfield, Anhui, China: Discussion. ORE GEOLOGY REVIEWS, 2018, 102: 937-939.

5. Nechaev, V. P.; Dai, S.; Sutherland, F. L., et al. The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia. ACTA GEOLOGICA SINICA-ENGLISH EDITION, 2018, 92(5): 1991-2003.

6. Dai, S.; Ji, D.; Ward, C. R., et al. Mississippian anthracites in Guangxi Province, southern China: Petrological, mineralogical, and rare earth element evidence for high-temperature solutions. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2018, 197: 84-114.

7. Dai, S.; Ward, C. R.; French, D., et al. Comments on Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China. ENERGY & FUELS, 2018, 32(8): 8891-8894.

 8. Dai, S.; Xie, P.; French, D., et al. The occurrence of buddingtonite in super-high-organic-sulphur coals from the Yishan Coalfield, Guangxi, southern China. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2018, 195: 347-361.

9. Yan, X.; Dai, S.; Graham, I. T., et al. Determination of Eu concentrations in coal, fly ash and sedimentary rocks using a cation exchange resin and inductively coupled plasma mass spectrometry (ICP-MS). INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2018, 191: 152-156.

10. Lauer, N.; Vengosh, A.; Dai, S. Naturally occurring radioactive materials in coals and coal ash in China. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 255: 572.

11. Liu, J.; Ward, C. R.; Graham, I. T., et al. Modes of occurrence of non-mineral inorganic elements in lignites from the Mile Basin, Yunnan Province, China. Fuel, 2018, 222: 146-155.

12. Dai, S.; Guo, W.; Nechaev, V. P., et al. Modes of occurrence and origin of mineral matter in the Palaeogene coal (No. 19-2) from the Hunchun Coalfield, Jilin Province, China. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2018, 189: 94-110.

13. Dai, S.; Nechaev, V. P.; Chekryzhov, I. Yu., et al. A model for Nb-Zr-REE-Ga enrichment in Lopingian altered alkaline volcanic ashes: Key evidence of H-O isotopes. LITHOS, 2018, 302: 359-369.

14. Wei, Q.; Dai, S.; Lefticariu, L., et al. Electron probe microanalysis of major and trace elements in coals and their low-temperature ashes from the Wulantuga and Lincang Ge ore deposits, China. FUEL, 2018, 215: 1-12.

15. Dai, S.; Finkelman, R. B. Coal as a promising source of critical elements: Progress and future prospects. INTERNATIONAL JOURNAL OF COAL GEOLOGY. 2018, 186: 155-164.

16. Zhao, L.; Ward, C. R.; French, D., et al. Origin of a kaolinite-NH4-illite-pyrophyllite-chlorite assemblage in a marine-influenced anthracite and associated strata from the Jincheng Coalfield, Qinshui Basin, Northern China. INTERNATIONAL JOURNAL OF COAL GEOLOGY. 2018, 185: 61-78.

17. Dai, S.; Finkelman, R. B. Coal geology in China: an overview. INTERNATIONAL GEOLOGY REVIEW, 2018, 60(SI): 531-534.

18. Dai, S.; Yan, X.; Ward, C. R., et al. Valuable elements in Chinese coals: a review. INTERNATIONAL GEOLOGY REVIEW, 2018, 60(SI): 590-620.

19. Liu, S.; Qi, Chuan; Jiang, Z., et al. Mineralogy and geochemistry of ash and slag from coal gasification in China: a review. INTERNATIONAL GEOLOGY REVIEW, 2018, 60 (SI): 717-735.

20. Dai, S.; Zheng, X.; Wang, X., et al. Stone coal in China: a review. INTERNATIONAL GEOLOGY REVIEW. 2018, 60(SI): 736-753.

21. Dai, S.; Ward, C. R.; Graham, I. T., et al. Altered volcanic ashes in coal and coal-bearing sequences: A review of their nature and significance. EARTH-SCIENCE REVIEWS. 2017, 175: 44-74.

22. Lauer, N.; Vengosh, A.; Dai, S. Naturally Occurring Radioactive Materials in Uranium-Rich Coals and Associated Coal Combustion Residues from China. ENVIRONMENTAL SCIENCE & TECHNOLOGY. 2017, 51(22): 13487-13493.

23. Kolker, A.; Scott, C.; Hower, J. C., et al. Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe. INTERNATIONAL JOURNAL OF COAL GEOLOGY. 2017, 184: 1-10.

24. Wei, Q.; Rimmer, S. M.; Dai, S. Distribution of Trace Elements in Fractions after Micronization and Density-Gradient Centrifugation of High-Ge Coals from the Wulantuga and Lincang Ge Ore Deposits in China. ENERGY & FUELS. 2017, 31(11): 11818-11837.

25. Dai, S.; Xie, P.; Ward, C. R., et al. Anomalies of rare metals in Lopingian super-high-organic-sulfur coals from the Yishan Coalfield, Guangxi, China. ORE GEOLOGY REVIEWS. 2017, 88: 235-250.

26. Etschmann, B.; Liu, W.; Li, K., et al. Enrichment of germanium and associated arsenic and tungsten in coal and roll-front uranium deposits. CHEMICAL GEOLOGY. 2017, 463: 29-49.

27. Hower, J. C.; Groppo, J. G.; Graham, U. M., et al. Coal-derived unburned carbons in fly ash: A review. INTERNATIONAL JOURNAL OF COAL GEOLOGY. 2017, 179: 11-27.

28. Dai, S.; Bartley, R.; Bartley, S., et al. Organic geochemistry of funginite (Miocene, Eel River, Mendocino County, California, USA) and macrinite (Cretaceous, Inner Mongolia, China). INTERNATIONAL JOURNAL OF COAL GEOLOGY. 2017, 179: 60-71.

29. Zhao, Lei; Zhu, Qin; Jia, Shaohui; Zou, Jianhua; Nechaev, Victor P.; Dai, Shifeng; Origin of Minerals and Critical Metals in an Argillized Tuff from the Huayingshan Coalfield, Southwestern China. MINERALS, 2017, 7(6), 6.

30. Liu, J.; Dai, S.; He, X., et al. Size-Dependent Variations in Fly Ash Trace Element Chemistry: Examples from a Kentucky Power Plant and with Emphasis on Rare Earth Elements. ENERGY & FUELS. 2017, 31(1): 438-447.

31. Dai, S.; Xie, P.; Jia, S., et al. Enrichment of U-Re-V-Cr-Se and rare earth elements in the Late Permian coals of the Moxinpo Coalfield, Chongqing, China: Genetic implications from geochemical and mineralogical data. ORE GEOLOGY REVIEWS. 2017, 80: 1-17.

32. Zhao, L.; Dai, S.; Graham, I. T., et al. Cryptic sediment-hosted critical element mineralization from eastern Yunnan Province, southwestern China: Mineralogy, geochemistry, relationship to Emeishan alkaline magmatism and possible origin. ORE GEOLOGY REVIEWS. 2017, 80: 116-140.

33. Kostova, I.; Vassileva, C.; Dai, S. et al. Mineralogy, geochemistry and mercury content characterization of fly ashes from the Maritza 3 and Varna thermoelectric power plants, Bulgaria. FUEL, 2016, 186: 674-684.

34. Hower, J. C.; Dai, S. Petrology and chemistry of sized Pennsylvania anthracite, with emphasis on the distribution of rare earth elements. FUEL, 2016, 185: 305-315.

35. Zhao, L.; Dai, S.; Graham, I. T., et al. New insights into the lowest Xuanwei Formation in eastern Yunnan Province, SW China: Implications for Emeishan large igneous province felsic tuff deposition and the cause of the end-Guadalupian mass. LITHOS, 2016, 264: 375-391.

36. Dai, S.; Liu, J.; Ward, C. R., et al. Mineralogical and geochemical compositions of Late Permian coals and host rocks from the Guxu Coalfield, Sichuan Province, China, with emphasis on enrichment of rare metals. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2016, 166(SI): 71-9.

37. Zhao, L.; Dai, S.; Graham, I. T., et al. Clay Mineralogy of Coal-Hosted Nb-Zr-REE-Ga Mineralized Beds from Late Permian Strata, Eastern Yunnan, SW China: Implications for Paleotemperature and Origin of the Micro-Quartz. MINERALS, 2016, 6(2).

38. Wang, X.; Sanei, H.; Dai, S., et al. A novel method to estimate mineral compositions of mudrocks: A case study for the Canadian unconventional petroleum systems. MARINE AND PETROLEUM GEOLOGY, 2016, 73: 322-332.

39. Hower, J. C.; Eble, C. F.; Dai, S., et al. Distribution of rare earth elements in eastern Kentucky coals: Indicators of multiple modes of enrichment? INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2016, 160: 73-81.

40. Dai, S.; Graham, I. T.; Ward, C. R. A review of anomalous rare earth elements and yttrium in coal. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2016, 159: 82-95.

41. Dai, S.; Chekryzhov, I. Yu; Seredin, V. V., Net al. Metalliferous coal deposits in East Asia (Primorye of Russia and South China): A review of geodynamic controls and styles of mineralization. GONDWANA RESEARCH, 2016, 29(1): 60-82.

42. Kostova, I.; Vassileva, C.; Dai, S., et al. Influence of surface area properties on mercury capture behaviour of coal fly ashes from some Bulgarian power plants. INTERNATIONAL JOURNAL OF COAL GEOLOGY, 2017, 116: 227-235.