Latex option for tex()



Dear group,

What is the option to set to get LaTeX output from the tex(expr) function?
(I especially would like to get \frac{}{} instead of {}\over{}).

I have seen it once on the list, but could not find it in the archives. I also tried looking into the mactex.lisp but did not find anything there. 

Thanks,
          G?ran
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