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- [5] CONTINUED OPTIMISTIC OUTLOOK FOR PAPER AND PAPERBOARD INDUSTRY AMERICAN PAPER INDUSTRY, 1973, 55 (12): : 46 - 47
- [6] TRENDS OF CHEMICAL INDUSTRY AND CHEMICAL MARKETS INDUSTRIAL AND ENGINEERING CHEMISTRY, 1953, 45 (11): : 2477 - 2481
- [8] CONTINUED BETTERING IN NORWEGIAN PULP AND PAPER-INDUSTRY NORSK SKOGINDUSTRI, 1979, 33 (06): : 146 - 147