Indeed. :-) busunsl's intro to references is also quite useful.
IMHO, one of the best discussions of complex data structures, and how to access their innards (using slices and so on), is to be found in Chapter 3. References and complex data structures of perlinter.pdf, available from Perl Training Australia. The OP would probably want the most current version of the course notes, though, which have been reworked into progperl.pdf, available from the same page noted above.
HTH,
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