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semanticscholar.org
api.semanticscholar.org
Healy, Paul F.; Awe, Jaime J.; Iannone, Gyles; Bill, Cassandra (June 1995). «Pacbitun (Belize) and ancient Maya use of slate». Antiquity69 (263): 337-348. S2CID162523022. doi:10.1017/S0003598X00064735.
Glass, Alexander; Blake, Daniel B. (April 2004). «Preservation of tube feet in an ophiuroid (Echinodermata) from the Lower Devonian Hunsrück Slate of Germany and a redescription of Bundenbachia beneckei and Palaeophiomyxa grandis». Paläontologische Zeitschrift78 (1): 73-95. S2CID140689763. doi:10.1007/BF03009131.
Fundación Centro Tecnológico de la Pizarra. Report into the "Technical properties of Bambui Slate from the State of Minas Gerais (Brazil) to ascertain its compliance with the Standard EN12326". Brazilian Slate ReportArchivado el 14 de febrero de 2010 en Wayback Machine., retrieved on 27 January 2010
Fundación Centro Tecnológico de la Pizarra. Report into the "Technical properties of Bambui Slate from the State of Minas Gerais (Brazil) to ascertain its compliance with the Standard EN12326". Brazilian Slate ReportArchivado el 14 de febrero de 2010 en Wayback Machine., retrieved on 27 January 2010