-.IR refer (1).
-These files contain bibliographic references
-(or other kinds of information) separated by blank lines.
-.PP
-A bibliographic reference is a set of lines,
-constituting fields of bibliographic information.
-Each field starts on a line beginning with a ``%'',
-followed by a key-letter, then a blank,
-and finally the contents of the field,
-which may continue until the next line starting with ``%''.
-.PP
-.I Indxbib
-is a shell script that calls
-/usr/lib/refer/mkey and /usr/lib/refer/inv.