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https://excellence.org.il/space/forum/viewtopic.php?pid=133241#p133241
http://www.mathmodelling.sg/forum/phpBB3/viewtopic.php?f=7&t=28759&p=124514#p124514
http://0.0.0.ehhkzg.mannlist.com/viewtopic.php?f=10&t=41188948&p=41883127#p41883127
http://centurystink.net/index.php?topic=197133.new#new
http://www.mixlm.com/forum.php?mod=viewthread&tid=120797&extra=
