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- [24] UNIFORM EUROPEAN GRADING RULES FOR BUILDING TIMBER JOURNAL OF THE INSTITUTE OF WOOD SCIENCE, 1974, 6 (05): : 6 - 16
- [26] Developing an Understanding for Grading Timber in Existing Buildings STRUCTURAL HEALTH ASSESSMENT OF TIMBER STRUCTURES, 2013, 778 : 1049 - 1055
- [29] Control and calibration of timber strength grading machines 1ST INTERNATIONAL RILEM SYMPOSIUM ON TIMBER ENGINEERING, 1999, 8 : 533 - 542
- [30] Ultrasonic timber grading applied to forest products 5TH WORLD CONFERENCE ON TIMBER ENGINEERING, VOL 2, PROCEEDINGS, 1998, : 818 - 819