1. DIBt, German Technical Approval Z-9.1-704. Glulam made of oak. Holder of approval: Elaborados y Fabricados Gámiz. S.A. Spain. issued by DIBT, Germany (2012)
2. DIBt, German Technical Approval Z-9.1-821. Holz Schiller oak post and beam glulam. Holder of approval: Holz Schiller GmbH. Germany. issued by DIBT, Germany (2013)
3. OIB, ETA-13/0642 European Technical Approval VIGAM-Glued laminated timber of oak. Holder of approval: Elaborados y Fabricados Gámiz. S.A. Spain. issued by OIB, Austria (2013)
4. EN 14080:2013 Timber structures—Glued laminated timber and glued solid timber—Requirements
5. EN 408:2012 Timber structures – Structural timber and glued laminated timber – Determination of some physical and mechanical properties