1. ISO 5069/1, 1983. Brown coals and lignites—Principles of sampling. Part 1: Sampling for determination of moisture content and general analysis.
2. ISO 5069/2, 1983. Brown coals and lignites—principles of sampling. Part 2: Sample preparation for determination of moisture content and general analysis.
3. The Late Permian tectonopalaeogeography and distribution of coal-rich zones in southwest China;Li,1990
4. Late Permian sequence stratigraphic framework and controlling factors in southern Yangtze platform and its margin;Li;Journal of China University of Geosciences,1999
5. Distribution of trace elements in coal minerals of selected Eastern United States coal;Palmer,1985