@code{GNU.sparse.name}. Thus, those @command{tar} implementations
that are not aware of GNU extensions will at least extract the files
into separate directories, giving the user a possibility to expand it
-afterwards @FIXME-ref{how to extract sparse file using third-party
-@command{tar}s}.
+afterwards. @xref{extracting sparse v.0.x, Extraction of sparse
+members in v.0.1 format}, for the detailed description of how to
+restore such members using non-GNU @command{tar}s.
The resulting @code{GNU.sparse.map} string can be @emph{very} long.
Although POSIX does not impose any limit on the length of a @code{x}