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Petras, L. (1980). A Systems Analysis Study to Compare the Long-term Consequences of Innovation Policies with Regard to Underground Coal Mining. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-80-160

Petras, L. (1980). On Future Coal Mining and Human Underground Activity. IIASA Professional Paper. IIASA, Laxenburg, Austria: PP-80-010