search for: odiaeresis

Hi I'm having difficulty following the advice in section 2.7 of R-exts. In one of my packages, there is a function called mobius(). I want to refer to it in the Rd file as the M??bius function, and to illustrate the M??bius inversion formula (just to be explicit: this is "Mobius" but with two dots over the second letter). R-exts section 2.7 gives \enc{J??reskog}{Joreskog}