my $x = \$z;
# "$x is a reference to scalar $z"

my $y = $$x;
# "$y is a copy of the scalar referenced by $x"

my $w = $row{b};
# "$w is assigned the value of %row's 'b' entry"

my @v = @{$row{b}};
# "@v is a copy of the array referenced by %row's b entry"