1. EN 844: Round and Sawn Timber. Terminology. European Committee for Standardization CEN, Brussels, B (2018)
2. ISO/DIS 24294: Timber. Round and Sawn Timber. Vocabulary (draft), International Organization for Standardization (ISO), Vernier, Geneva, CH (2020)
3. Fröbel, J.: Grading of Sawn Timber in Europe According to EN 1611-1. Swedish Wood, Stockholm, SE (2016)
4. Ross, B. (ed.): USDA, Wood Handbook—Wood as an Engineering Material. General Technical Report FPL-GTR-190. Department of Agriculture (USDA), Forest Service, Forest Products Laboratory, Madison, WI, USA (2010)
5. Shmulsky, R., David Jones, P.: Forest Products and Wood Science. An Introduction, 6th edn. Wiley-Blackwell, Chichester, WS, USA (2011)