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http://www.umoke.tw/group/forum.php?mod=viewthread&tid=230330&extra=
http://www.mathmodelling.sg/forum/phpBB3/viewtopic.php?f=7&t=130543
http://longjian.3cdma.com/viewthread.php?tid=188176&pid=532070&page=1380&extra=#pid532070
https://excellence.org.il/space/forum/viewtopic.php?pid=317059#p317059
http://forum.team-n.ru/index.php?showtopic=371394