indyank - 3:35 am on Feb 23, 2011 (gmt 0)
Yes, they don't have href attribute.Many would miss the fact that the url is specified against rel attribute and not the href attribute.
The whole stinking stuff has been designed to hoodwink everyone.
What wikipedia does is acceptable as it is UGC and google suggests to add nofollow to external links in UGC.
Two years ago, eHow had dofollow links to their references.It looks like rel=nofollow had been added after DemandMedia's acquisition and then they went on to do what we see now.