% perl -dee

Loading DB routines from perl5db.pl version 1.49_05
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(-e:1):    e
  DB<1> $q='qwer'

  DB<2> @a=( \$q )

  DB<3> x @a
0  SCALAR(0x1158960)
   -> 'qwer'
  DB<4> p ${$a[0]}
qwer
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So essentially

print ${ $scalar_ref };
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See also References quick reference