http://php.net/manual/en/features.gc.collecting-cycles.php

has a reference ''Concurrent Cycle Collection in Reference Counted Systems'' to 
http://www.research.ibm.com/people/d/dfb/papers/Bacon01Concurrent.pdf

The PDF is no longer there.

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Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT 
Lecturer.
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