gistfile1.txt

``disambiguate-add-year-suffix`` [Step (4)]
    If set to "true" ("false" is the default), an alphabetic year-suffix is
    added to ambiguous cites (e.g. "Doe 2007, Doe 2007" becomes "Doe 2007a, Doe
    2007b"). Additional letters are used once "z" is reached ("z", "aa", "ab",
    ..., "az", "ba", etc.). Year-suffixes are assigned based on the order of the
    bibliographies entries. By default the year-suffix is appended to each cite,
    but its location can be controlled by explictly rendering the "year-suffix"
    variable using ``cs:text``. If "year-suffix" is rendered through ``cs:text``
    in the scope of ``cs:citation``, it is suppressed for ``cs:bibliography``,
    unless it is also rendered through ``cs:text`` in the scope of
    ``cs:bibliography`` (and vice versa).