From Wikipedia, the free encyclopedia
|This article is an orphan, as no other articles link to it. Please introduce links to this page from related articles; try the Find links tool for suggestions. (January 2012)|
- "ISO 2921:2011". International Organization for Standardization. 2011. Retrieved October 21, 2011.
|This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it.|