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2. The importance of tonstein from the coal seam 610 as the correlation horizon in the southwestern part of the upper Silesian Coal Basin;Adamczyk;Kwartalnik Geologiczny,1997
3. Volcanogenic tonsteins from Tertiary coal measures, East Kalimantan, Indonesia;Addison;Int. J. Coal Geol.,1983
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5. Geochemical variation of Arctic margin low-sulfur Cretaceous and Tertiary coals, North Slope, Alaska;Affolter;Open-File Report (U.S. Geol. Surv.),1992