Well, initially I was just going to suggest you use \footnote, but that of course requires that you then have a number somewhere else refering to it...
So, the easiest thing I can think of is to use something like this:
Code:
\footnotetext{\tiny{Steiner, et al., arXiv:0711.4652 [nucl-ex]}}
And to get rid of the number "0", add something like this to your headers
Code:
\renewcommand{\thefootnote}{}
and if you don't want the line, I think you need to add this to your headers:
Code:
\renewcommand{\footnoterule}{}
Not ideal perhaps...
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