Reference
E. Stach, M.-Th. Mackowsky, M. Teichmüller, G. H. Taylor, D. Chandra andR. Teichmüller, “Stach's Textbook of Coal Petrology”, (Gebrüder Borntraeger, Berlin and Stuttgart, 1975).
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Macmillan, N.H., Rickerby, D.G. On the measurement of hardness in coal. J Mater Sci 14, 242–246 (1979). https://doi.org/10.1007/BF01028354
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DOI: https://doi.org/10.1007/BF01028354