1. European agreement concerning the international carriage of dangerous goods by road (ADR) 2012 http://www.unece.org/trans/danger/publi/adr/adr2013/13ContentsE.html
2. Convention concerning international carriage by rail (COTIF) - appendix C - regulations concerning the international carriage of dangerous goods by rail (RID) http://www.otif.org/en/publications/rid-2013.html
3. The effectiveness of the United Nations' leakproofness tests;Löschau;Packaging Technology and Science,1989
4. Bubble tests for gas tightness;Biram;Vacuum,1964