-document. They only appear if they are referred to by a \c{\\k}
-command (see \k{input-xref}). This allows you to (for example)
-maintain a single Halibut source file with a centralised database of
-\e{all} the references you have ever needed in any of your writings,
-include that file in every document you feed to Halibut, and have it
-only produce the bibliography entries you actually need for each
-particular document. (In fact, you might even want this centralised
-source file to be created automatically by, say, a Perl script from
-BibTeX input, so that you can share the same bibliography with users
-of other formatting software.)
+document. They only appear if they are \I{citation}referred to by a
+\i\c{\\k} command (see \k{input-xref}). This allows you to (for
+example) maintain a single Halibut source file with a centralised
+database of \e{all} the references you have ever needed in any of
+your writings, include that file in every document you feed to
+Halibut, and have it only produce the bibliography entries you
+actually need for each particular document. (In fact, you might even
+want this centralised source file to be created automatically by,
+say, a Perl script from BibTeX input, so that you can share the same
+bibliography with users of other formatting software.)