Keyword "SOURCE OF GRAPHITE" in:
Evaluation of black shales as a source of energy and environmental impacts of their possible combustion in Burkina Faso (west Africa): results of the project in 2002 and final recommendations
Pašava,J., Bezuško,P., Komínek,E., Kříbek,B., Wenmenga,U., volume 36, 2003 (GRR for 2002), pages 211–213
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