1. Modern concepts of the physical constitution of coal;Cady;J. Geol.,1942
2. Macerals and physico-chemical properties of Loping Bark coal;Dai;J. China Coal Soc.,1984
3. Novel development in the genesis of Lopinite of China;Guo,1992
4. Study of Plagiozamites oblongifolius, Compsopteris and Gigantopteris and the paleoecology of coal- forming vegetations of the Late Permian in the west of Guizhon;Guo,1987