I published an article entitle entitled "The WADP Numbering System (WNS)" in Philateli-Graphics 29:2 (April 2007). In this article, I describe how the WNS works, and I advocate that philatelists should make greater use of it to view and research stamps. To view the article in PDF format, click here. After the article was published, I sent a copy of it to the Universal Postal Union. If you click here, you will be able to see the UPU's response to me.
I have published "The Dimensions of Metric-Sized Postage Stamps" in American Philatelist 123:12 (December 2009): 1156-1157.