http://www.sciencedirect.com/science/article/pii/S0140673601545791
http://pghelper.org/forum.php?mod=attachment&aid=MjJ8NmYyNDZkNDJ8MTQxMDU0OTgyM3wxMDA0fDkzNw%3D%3D
http://pghelper.org/forum.php?mod=attachment&aid=MjJ8NmYyNDZkNDJ8MTQxMDU0OTgyM3wxMDA0fDkzNw%3D%3D
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