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Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987045
p.45-60
Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987048
p.127-154
Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987055
p.297-348