Keeping a PDF article's bibliography always visible While reading an article, I like to keep the bibliography pages at the tail of the article visible at the same time as I am going through the pages of the article.

Two obvious ways for doing this are


Open the pdf article twice, once with Preview and another with Adobe Reader.
Temporarily make a copy of the article and open both with Preview.


Am I omitting something? Is there really no natural/easier way to do this on a Mac?
In Adobe Reader, when reading your document, you can choose "New Window" to view two different spots in the same document.  Do it again if you want to view three spots.