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Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987063
p.507-534
Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987066
p.615-664
Artigo – doi 10.5151/1TH-MEETING-COAL-1987-1987067
p.665-691