[OS X TeX] Only referencing once

[Serge Cohen]

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Hi;

I'm looking for a package (or a macro command) to have the following 
capability:

I have command which I used throught my PhD to typeset standard words 
(like program names), so that they will be always typed the same, and 
referenced in the index. On top of that I would like that a 
bibliographic reference be added the FIRST time the program name appear 
in the document. The best for me would be to have a command used this 
way:

\newcommand{\Foo}{\firt{{Foo \index{Foo} \cite{foo:program}},{Foo 
\index{Foo}}}}

Or eventually giving one more argument, giving a name for the variable 
(counter, boolean???) holding the number of time the command appeared.

Thanks for any info/help.

Serge.

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Serge Cohen

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