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4. Bollmus S (2011) Biologische und technologische Eigenschaften von Buchenholz nach einer Modifizierung mit 1,2-dimethylol-4,5-dihydroxyethylenurea (DMDHEU). [Biological and technological properties of beech wood after modification with 1,2-dimethylol-4,5-dihydroxyethylenurea (DMDHEU)], (In German). Dissertation, Georg-August-Universität Göttingen
5. DIN 52 186 (1978) Testing of wood; bending test. German Institute for Standardization