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Pengine references
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Pengines: Web Logic Programming Made Easy
An overview of Pengines
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1.1
Pengine references
http://www.swi-prolog.org/pldoc/man?section=threads
http://www.swi-prolog.org/pldoc/package/http.html
D. Brand and P. Zafiropulo. On communicating finite-state machines.
Journal of the ACM
, 30(2):323-342, 1983.
http://www.swi-prolog.org/pldoc/package/semweb.html
http://cliopatria.swi-prolog.org/home
http://www.swi-prolog.org/pldoc/doc/home/vnc/prolog/lib/swipl/library/sandbox.pl
