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May 27, 2017 at 6:22 history edited user111 CC BY-SA 3.0
added 68 characters in body
May 26, 2017 at 20:08 comment added T. Amdeberhan It's important to mention that the results in the paper are for real coefficients. Also, notice that Fedor already pointed out the "sharp" case in the comment above.
May 26, 2017 at 20:01 history answered user111 CC BY-SA 3.0