[R] ouml in an .Rd

[Paul Gilbert]

I am trying to put an ouml in an .Rd file with no success. Writing R 
Extensions suggests:

Text which might need to be represented differently in different 
encodings should be marked by |\enc|, e.g. |\enc{Jöreskog}{Joreskog}| 
where the first argument will be used where encodings are allowed and 
the second should be ASCII (and is used for e.g. the text conversion).

(Above may get mangled by the mail.) I have tried variations

   \enc{J"oreskog}{Joreskog}
   \enc{J\"oreskog}{Joreskog}
   \enc{Jo\"reskog}{Joreskog}
   \enc{Jo\"reskog}{Joreskog}
   \enc{J\"{o}reskog}{Joreskog}
   \enc{J\\"{o}reskog}{Joreskog}
   \enc{Jöoreskog}{Joreskog}

all with no effect on the generated pdf file.  Suggestions would be 
appreciated.

Thanks,
Paul Gilbert