Pardon replying to myself but there is even better code for this
> <bibl id="bib-p23.1">
> ... as much stuff as there can be ...
> <note place="end">
> See his
> <bibl id="bib-n98">
> <title>Mating of grues</title>.
> <link targets="bib-p23.1 bib-n98" />
... as much stuff as there can be ...
<title id="t:miller">Mating of grues</title>.
<join targets="a:miller t:miller" result="bibl" />
This is so nice, I had to correct it.