↑ "Archived copy" (PDF). Archived from the original (PDF) on 2014-04-13. Retrieved 2014-04-10. , Water Vapor Permeation Testing of Ultra-Barriers: Limitations of Current Methods and Advancements Resulting in Increased Sensitivity, M. Stevens et Al. ↑ , "Institute of Materials Research and Engineering (IMRE) MEDIA RELEASE, 29 April 2008, Singapore research produces world’s best protection from moisture and oxygen" ↑ , Water Vapour Transmission Rate Measurements, 1 June 2011 ↑ , G. Nisato, Permeation Methods, Deliverable D5b FLEXled-phr-0209-009/Public Report, September 2002, ↑ , Electrical Calcium Test for Measuring Barrier Permeability, National Renewable Energy Laboratory ↑ http://www.astm.org/Standards/D7709.htm