| Version 1.1 June 5, 2007 | Greek letters were converted from images to HTML code in the text. Equations remain displayed as images. Reference #38 corrected volume and number to 96(8). |
| Version 1.0 November 15, 2001 | Web version online. |
| Original Publication September−October 2001 | Journal of Research of the National Institute of Standards and Technology, 106 (2001), 28 pages. |