... appears.¹¹

To avoid any ambiguity if a page break occurs right at an \index command, it's a good idea to attach the command to a word instead of putting it between words.

... page.²²

The use of ``28ff.'' rather than ``28–32'' is frowned upon by the experts.

... command.³³

In versions of L^ATEX released before 3 February 1987, you must use the \string command instead of \protect.