Agabekova, A., A. Tusiphan, GudunК., M. Baikenov, Z. Kairbekov, and K. Zhubanov. “Liquefaction of Coal of Shubarkul Field in Catalysts Presence”. Chemical Bulletin of Kazakh National University, Vol. 64, no. 4, Dec. 2011, pp. 16-20, doi:https://doi.org/10.15328/chemb_2011_416-20.