Based on: Levlin, J-E. General physical properties of paper and board (Chapter 7). In: Levlin, J-E. & Sjöderhelm, L. (ed), Pulp and paper testing (Book 17), Papermaking Science and Technology. Jyväskylä. 1999. Fapet Oy. pp. 136–161.
Waterhouse, J. F., “The ultrasonic testing of paper and board – principles and applications”, TAPPI 1993 Process and Product Quality Conference Proceedings, TAPPI PRESS, Atlanta, p. 97.
Markström, H., Properties of Paper-Test Methods and Measurement Instruments, 2nd Edition, Lorentzen & Wettre, Stockholm, 1991.
Proksch, A. and Niessner, G., Allgemeine Papier-Rundschau 35(4):1148(1973) (in German).
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