Based on: Laamanen, J., Permanent papers (Chapter 12). In: Levlin, J-E. & Sjöderhelm, L. (ed), Pulp and paper testing (Book 17), Papermaking Science and Technology. Jyväskylä. 1999. Fapet Oy. pp. 248-255.
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Crouse, B. W. and Sanderson, E. H., Japan Tappi, 2:238 (1992).
Abadie-Maumert, F. A. and Soteland, N. A., Rev. ATIP. 44(6):223(1990).
Johnson, R. W. and Bird, A., “CTMP in fine papers: impact of CTMP on permanence of alkaline papers”, TAPPI 1991 Papermakers Conference Proceedings, TAPPI Press, Atlanta, p. 267.
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