Reference
MLI - Writings - Tech notes - CSS Tip #2: Making Your Site Modifiablehttp://www.rdrop.com/~half/Creations/Writings/TechNotes/css.tip.2.html
Eric A. Meyer
http://www.meyerweb.com/eric/
[css-d] CSS signatures - 13291 - 2002-09-28
http://archivist.incutio.com/viewlist/css-discuss/13291
via
Note @ Temporary-Depot - 2005-01-11http://www.pandora.nu/tempo-depot/notes/2005/01/11/#d050111