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2. Rotliegend-Farne in weissen Vulkan-Aschen-“Tonsteine” der Döhlen-Formation als paläobotanische Fundschichten;Barthel;Veroff. Mus. Nat.kd. Chemnitz,1995
3. Lycopod succession in coals: an example from the Low Barnsley Seam (Westphalian B), Yorkshire, England;Bartram,1987
4. Regional geology of Ninxia Hui Autonomous Region;Bureau of Geology and Mineral Resources of Ningxia Hui Autonomous Region,1990
5. Regional geology of Nei Mongol (Inner Mongolia) Autonomous Region;Bureau of Geology and Mineral Resources of Nei Mongol Autonomous Region,1991