1. Alakangas E (1995) Demonstration project of the bioenergy research programme started. Energia 10(5):30–31
2. Björheden R, Apel K, Shiba M, Thompson M (1995) IUFRO Forest work study nomenclature. Swedish University of Agricultural Science, Dept. of Operational Efficiency, Garpenberg. 16 p
3. Buggie WJ (1991) Flail chippers can improve fibre utilization in small softwoods. Canadian Forest Industries Magazine, August/September, 28–31
4. Chahal A, Ciolkosz D (2019) A review of wood-bark adhesion: methods and mechanics of debarking for woody biomass. Wood Fiber Sci 51(3):1–12
5. Cordes C (2020)Personal communication, E-mail on December 2nd, 2020 @ 11:49. Astec Industries, Eugene, OR, USA