I happen to be an editor on Wikipedia. I kill ton's of links that don't add something, but I will say this, there is a ton a quality content that I have seen on promotional site that fit perfect with Wikipedia. When I find that type, I move the link to the top of the list.
so for those that post links, and want them to stick, make some quality content on the landing page, and I assure you that it will stay. Better yet, do this: improve the Wiki entry, ad your dissertation to your web site, post a link as a reference to the dissertation, and 90% of the other editors will not even bother it.
I have about 60 links of my own in Wiki, following the guild lines above, and I have a very narrow focus area.