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Oct 1, 2017 at 13:09 comment added GA316 Great answer. I am excited to know there is this much literature behind this question. Thanks.
Sep 30, 2017 at 21:36 history edited Alexander Chervov CC BY-SA 3.0
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Sep 30, 2017 at 21:31 history edited Alexander Chervov CC BY-SA 3.0
added 50 characters in body
Sep 30, 2017 at 21:24 history answered Alexander Chervov CC BY-SA 3.0