There are several ways to do this.
The easiest way to contact the main authors is to look at the tab marked "history" ( http://en.wikipedia.org/w/index.php?title=Beta-binomial_distribution&act...). That will show who has edited the page, and by clicking on the links marked "diff" next to various edits you can get an idea who wrote the basic article or added significant material, and who did tidying up, spelling fixes, etc. A click on the link for their "contribs" will show if thery are still likely to be active editors. If they are - drop a note on their talk pages.
But normally you don't need to contact the authors, nor is that the only solution. If you ask your question on the article's talk page (click the "discussion" tab) you will get help, also you can ask at the Wikipedia Reference Desk for Math ( http://en.wikipedia.org/wiki/Wikipedia:Reference_desk/Mathematics ).
If all else fails, try the reference texts named in the article, Google, a library, or a textbook.
FT2
On Fri, Jun 17, 2011 at 2:32 AM, Peng Yu pengyu.ut@gmail.com wrote:
Hi,
I have some questions regarding a wiki page, so I want to ask the authors of the page to get clarifications. Does anybody know how to find the authors and contact them, for example, for the following page?