c:\@Work\Perl\monks>perl -wMstrict -le
"my %hash = ( 'structure' => { 'uses plain sigil'  => 'dereference' } );
 my $hash = { 'reference' => { 'needs -> operator' => 'at top'      } };
 ;;
 print $hash    {'structure'}{'uses plain sigil' };
 print $hash -> {'reference'}{'needs -> operator'};
"
dereference
at top