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2. ASTM D1621-16 (2010), Standard Test Method for Compressive Properties of Rigid Cellular Plastics, ASTM International, West Conshohocken, PA.
3. ASTM (2014) Standard test method for apparent density of rigid cellular plastics. ASTM D1622/D1622M-14. ASTM International, West Conshohocken, Pennsylvania, USA
4. ASTM (2015) Standard test methods for rubber property—durometer hardness. ASTM D2240-15. ASTM International, West Conshohocken
5. ASTRA (2008) Einwirkungen infolge Steinschlags auf Schutzgalerien, Richtlinie (Effects of Rockfall on Protection Galleries, Guideline). Bundesamt für Strassen ASTRA (Federal Roads Office), Switzerland (in German)