While there aren't many references dedicated to autovivification, it's often mentioned in passing while analysing other topics.

perldoc:

Golf (in Perl, Python, Ruby, PHP):

Other:

CPAN:

Other cool autovivification references welcome.

Added later: 

👁️🍾👍🦟

In reply to Re^2: Using exists to check element in array (autovivification References) by eyepopslikeamosquito
in thread Using exists to check element in array by david

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