Raimo Alén, University of Jyväskylä and Victoria Lindqvist, Forest Products Engineers have modified mainly the text from the reference “Salmén, L., Lucander, M., Härkönen, E. and Sundholm, J. 2009. In: Lönnberg, B. (Ed.). Mechanical Pulping. 2nd edition. Paper Engineers’ Association, Helsinki, Finland. Pp. 35−67”.
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