Erkki Verkasalo (Research Professor, LUKE) has modified and updated the text from the reference “Hakkila, P and Verkasalo, E. 2009. Structure and properties of wood and woody biomass. In: Kellomäki, S. (Ed.). Forest Resources and Sustainable Management. 2nd edition. Paper Engineers’ Association, Helsinki, Finland. pp. 133-215”.
Hakkila, P., Repola, J., Kalaja, H. 2008. Suomalainen havukuitupuu. Finnish pulpwood from softwoods. Unpublished manuscript at the Finnish Forest Research Institute. 86 p.
Hakkila, P., Panhelainen, A. 1970. On the wood properties of Pinus contorta in Finland. Communicationes Instituti Forestalis Fenniae 73(1): 1–43. ISSN 0026-1610.
Hakkila, P. 1971. Coniferous branches as a raw material source. Communicationes Instituti Forestalis Fenniae 75(1): 1–60. ISSN 0026-1610.
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