4.4BSD/usr/src/contrib/bib/macs/afterpunct

.ds [. " \&
.ds .] .
.ds [, " \&
.ds ,] ,
.ds [? " \&
.ds ?] ?
.ds [: " \&
.ds :] :
.ds [; " \&
.ds ;] ;
.ds [! " \&
.ds !] !
.ds [" " \&
.ds "] \&"
.ds [' " \&
.ds '] '
.ds [< " \&
.ds >]